SlideShare uma empresa Scribd logo
1 de 29
Baixar para ler offline
Evidence for
Continental Drift
and The Theory of
Plate Tectonics
Did you know that the coal that is
mined in Pennsylvania was actually
formed from tropical plant life near
the Equator? How did it travel
northward to Pennsylvania? Scientists
believe that 200 million years ago,
when the dinosaurs dined upon
tropical ferns and tall tropical
vegetation, what is now Pennsylvania
was at a different location, namely the
equatorial region.
1. Alfred Wegener was the first scientist
to suggest that the fit of the continents of
South America and Africa may not be a
coincidence. He thought that the
continents may have been together at
some point in the past. He called this
“supercontinent” Pangaea
(this means “all land”).
2. In 1912, he proposed the
theory of continental drift, which
means that the continents have
moved to their current locations.
3. Besides the “puzzle-like” fit of
some of the continents, there is
substantial rock & fossil evidence
to support Wegener’s theory:
a. Like animal fossils have been
found oceans apart.
Evidence... notes
b. Fossils of the same green
plants have been found on almost
all continents, suggesting that
they all once had a similar
climates.
c. Additionally, fossils of tropical
plants have been found on islands
in the Arctic Ocean, suggesting
that area may have been much
warmer in the past.
d. Glacial deposits and
weathered rock (scientists think
this from moving ice) have been
found on South America, Africa,
India, and Australia. This could
mean that these lands were once
cold enough for glaciers to form
and eventually move around on
the land.
e. Similar rock structures are
found on different continents. For
example, mountains in the
United States are similar to ones
found on Greenland and in
Europe. Also, rocks in South
America and Africa are very
similar.
4. The discovery of sea-floor
spreading on the ocean’s floors
has given Wegener’s theory of
continental drift more support.
Evidence... notes
a. In the 1950’s, it was found
that the ocean floors have
mountains, valleys, and ridges,
just like the land on earth.
b. It was suggested (and later
agreed upon) that these
formations have been caused
by magma from the mantle
being pushed up through the
crust. Then, it flows to each
side as the process repeats.
http://www.wwnorton.com/earth/egeo/animations/ch2.htm
(Sea Floor Spreading)
c. This idea was supported by the
dating of rock found along the
ocean’s ridges. The youngest
rocks are found right along the
ocean’s ridges. The ages of the
rocks becomes increasingly
older as you move away from
the ridges.
http://www.wwnorton.com/college/geo/earth2/home.asp#animations
(Click on animation to the right)
This map shows
the ages of the rocks that
make up the floor of the
Atlantic Ocean. Red
represents the youngest
rocks; the deepest red
marks the Mid-Oceanic
Ridge, where continental
plates are pulling apart
and new crust is being
formed. Older rocks are
yellow, green, and blue.
5. Also supporting the idea of
seafloor spreading are clues
from the earth’s magnetic
poles.
a. Think of the earth having a giant
magnet in its core.
b. This creates a north and a south
poles on earth. We evidence of
these poles when we use a
compass.
c. Anyhow, scientists theorize that
these poles have reversed several
times over the lifespan of the earth.
This is supported by the discovery
of patterns in iron containing
minerals and rocks (remember, iron
is magnetic). Magnetic rocks are
“attracted” to the north pole, so
they are pulled towards it, and away
from the south pole.
Evidence... notes
Interesting…Our planet's magnetic
field reverses about once every
200,000 years on average.
However, the time between
reversals is highly variable. The
last time Earth's magnetic field
flipped was 780,000 years ago,
according to the geologic record
of Earth's polarity.
d. When the iron-containing
material on earth is studied, it
shows that this pattern has
changed over time. This is
especially apparent on the
oceans’ floor.
e. Did you know that the magnetic
north on earth is still
wandering? The magnetic pole
is currently 966 km (600 miles)
from the geographic one.
Evidence... notes
6. All of this scientific work has led
scientists to the theory of plate
tectonics, which states that the
earth’s crust is broken in to
sections which move around (or
float) on the mantle below. It is
this theory that helps to explain
how the earth’s surface has
changed and will continue to
change over time.
So what will the earth look like in the
future? We can only guess…
So what will the earth look like in the
future? We can only guess…

Mais conteúdo relacionado

Mais procurados

Continental Drift Theory Template
Continental Drift Theory TemplateContinental Drift Theory Template
Continental Drift Theory Templatemsteward
 
Continental drift and plate tectonics
Continental drift and plate tectonicsContinental drift and plate tectonics
Continental drift and plate tectonicscathyanns
 
The Theory of Pangaea by: Rebecca
The Theory of Pangaea by: RebeccaThe Theory of Pangaea by: Rebecca
The Theory of Pangaea by: RebeccaMs Wilson
 
SCIENCE Grade 10: Continental Drift Theory
SCIENCE Grade 10: Continental Drift TheorySCIENCE Grade 10: Continental Drift Theory
SCIENCE Grade 10: Continental Drift TheoryPaula Marie Llido
 
Continental Drift Theory-Abhinav gupta
Continental Drift Theory-Abhinav gupta Continental Drift Theory-Abhinav gupta
Continental Drift Theory-Abhinav gupta Abhinav Gupta
 
Continental Drift Theory
Continental Drift TheoryContinental Drift Theory
Continental Drift TheorySimple ABbieC
 
Plate tectonic theory evidence
Plate tectonic theory evidencePlate tectonic theory evidence
Plate tectonic theory evidencePraag Dogra
 
Continental drift and tectonic theory
Continental drift and tectonic theoryContinental drift and tectonic theory
Continental drift and tectonic theorysamuelchoi28
 
Continental drift theory
Continental drift theoryContinental drift theory
Continental drift theorymyknolasco
 
Continental drift - A2 Geography
Continental drift - A2 GeographyContinental drift - A2 Geography
Continental drift - A2 Geography6thformmatt
 
Continental drift theory
Continental drift theoryContinental drift theory
Continental drift theoryStudent
 
Continental Drift Presentation1
Continental Drift Presentation1Continental Drift Presentation1
Continental Drift Presentation1Andy Dorn
 
Theory+of+continental+drift
Theory+of+continental+driftTheory+of+continental+drift
Theory+of+continental+driftjcv57
 
Continental drift 2
Continental drift 2Continental drift 2
Continental drift 2Cha Villania
 
Alfred wegener presentation
Alfred wegener presentation Alfred wegener presentation
Alfred wegener presentation tf007236
 
Continental drift
Continental driftContinental drift
Continental driftJenny Dixon
 

Mais procurados (20)

Continental Drift Theory Template
Continental Drift Theory TemplateContinental Drift Theory Template
Continental Drift Theory Template
 
Continental drift and plate tectonics
Continental drift and plate tectonicsContinental drift and plate tectonics
Continental drift and plate tectonics
 
The Theory of Pangaea by: Rebecca
The Theory of Pangaea by: RebeccaThe Theory of Pangaea by: Rebecca
The Theory of Pangaea by: Rebecca
 
SCIENCE Grade 10: Continental Drift Theory
SCIENCE Grade 10: Continental Drift TheorySCIENCE Grade 10: Continental Drift Theory
SCIENCE Grade 10: Continental Drift Theory
 
Continental Drift Theory-Abhinav gupta
Continental Drift Theory-Abhinav gupta Continental Drift Theory-Abhinav gupta
Continental Drift Theory-Abhinav gupta
 
Continental Drift Theory
Continental Drift TheoryContinental Drift Theory
Continental Drift Theory
 
Plate tectonic theory evidence
Plate tectonic theory evidencePlate tectonic theory evidence
Plate tectonic theory evidence
 
Drifted supercontinent!
Drifted supercontinent!Drifted supercontinent!
Drifted supercontinent!
 
Continental drift and tectonic theory
Continental drift and tectonic theoryContinental drift and tectonic theory
Continental drift and tectonic theory
 
Continental drift theory
Continental drift theoryContinental drift theory
Continental drift theory
 
Continental drift - A2 Geography
Continental drift - A2 GeographyContinental drift - A2 Geography
Continental drift - A2 Geography
 
Continental drift theory
Continental drift theoryContinental drift theory
Continental drift theory
 
Continental drift theory
Continental drift theoryContinental drift theory
Continental drift theory
 
Continental Drift Presentation1
Continental Drift Presentation1Continental Drift Presentation1
Continental Drift Presentation1
 
Theory+of+continental+drift
Theory+of+continental+driftTheory+of+continental+drift
Theory+of+continental+drift
 
Continental drift 2
Continental drift 2Continental drift 2
Continental drift 2
 
Alfred wegener presentation
Alfred wegener presentation Alfred wegener presentation
Alfred wegener presentation
 
Continental drift
Continental driftContinental drift
Continental drift
 
Continentaldrift
ContinentaldriftContinentaldrift
Continentaldrift
 
Continental drift
Continental driftContinental drift
Continental drift
 

Destaque

Memahami konsep dasar tentang momentum linear
Memahami konsep dasar tentang momentum linearMemahami konsep dasar tentang momentum linear
Memahami konsep dasar tentang momentum linearAtikah Fauziah
 
Presentasi TUMBUKAN (by Gabriel)
Presentasi TUMBUKAN (by Gabriel)Presentasi TUMBUKAN (by Gabriel)
Presentasi TUMBUKAN (by Gabriel)Gabriel Marindal
 
Semester 1 exam study guide answers enmanuel
Semester 1 exam study guide answers enmanuelSemester 1 exam study guide answers enmanuel
Semester 1 exam study guide answers enmanuelEnmanuel Lily Hernandez
 
tumbukan lenting sempurna
tumbukan lenting sempurnatumbukan lenting sempurna
tumbukan lenting sempurnaipputdyana9
 
Bab 5 impuls dan momentum
Bab 5 impuls dan momentumBab 5 impuls dan momentum
Bab 5 impuls dan momentumOddy Syaputra
 
Ch. 7 glencoe worksheets
Ch. 7 glencoe worksheetsCh. 7 glencoe worksheets
Ch. 7 glencoe worksheetsLori Welsh
 

Destaque (8)

Momentum
MomentumMomentum
Momentum
 
Memahami konsep dasar tentang momentum linear
Memahami konsep dasar tentang momentum linearMemahami konsep dasar tentang momentum linear
Memahami konsep dasar tentang momentum linear
 
Presentasi TUMBUKAN (by Gabriel)
Presentasi TUMBUKAN (by Gabriel)Presentasi TUMBUKAN (by Gabriel)
Presentasi TUMBUKAN (by Gabriel)
 
Semester 1 exam study guide answers enmanuel
Semester 1 exam study guide answers enmanuelSemester 1 exam study guide answers enmanuel
Semester 1 exam study guide answers enmanuel
 
Momentum & impuls
Momentum & impulsMomentum & impuls
Momentum & impuls
 
tumbukan lenting sempurna
tumbukan lenting sempurnatumbukan lenting sempurna
tumbukan lenting sempurna
 
Bab 5 impuls dan momentum
Bab 5 impuls dan momentumBab 5 impuls dan momentum
Bab 5 impuls dan momentum
 
Ch. 7 glencoe worksheets
Ch. 7 glencoe worksheetsCh. 7 glencoe worksheets
Ch. 7 glencoe worksheets
 

Semelhante a Evidence... notes

evidences_plate.ppt
evidences_plate.pptevidences_plate.ppt
evidences_plate.pptRoyoMel
 
Plate tectonics theory.docx
Plate tectonics theory.docxPlate tectonics theory.docx
Plate tectonics theory.docxzohaibGiLL6
 
2012 updated plate tectonics new one use this one backup
2012 updated plate tectonics new one use this one backup2012 updated plate tectonics new one use this one backup
2012 updated plate tectonics new one use this one backupharvey09
 
Integ Sci 10 Lesson 1 [Autosaved].pptx
Integ Sci 10 Lesson 1 [Autosaved].pptxInteg Sci 10 Lesson 1 [Autosaved].pptx
Integ Sci 10 Lesson 1 [Autosaved].pptxNorbertoBGamayon
 
2013 updated plate tectonics new one use this one
2013 updated plate tectonics new one use this one2013 updated plate tectonics new one use this one
2013 updated plate tectonics new one use this oneharvey09
 
Unit 1. 2. 2 continental drift
Unit 1. 2. 2 continental driftUnit 1. 2. 2 continental drift
Unit 1. 2. 2 continental driftJed Encepto
 
Plate Tectonics
Plate TectonicsPlate Tectonics
Plate Tectonicsomerpasa
 
Plate Tectonics Essay
Plate Tectonics EssayPlate Tectonics Essay
Plate Tectonics EssayCherie King
 
Tectonics: Plate Tectonic Theory history
Tectonics: Plate Tectonic Theory historyTectonics: Plate Tectonic Theory history
Tectonics: Plate Tectonic Theory historygeomillie
 
Time traveling alfred wegener essay
Time traveling alfred wegener essayTime traveling alfred wegener essay
Time traveling alfred wegener essayTanya14
 
Continental drift &and sea floor spreading
Continental drift &and sea floor spreadingContinental drift &and sea floor spreading
Continental drift &and sea floor spreadingMd Asif Hasan
 
Dynamic Earth Chapter 3 Plate Tectonics 1
Dynamic Earth Chapter 3 Plate Tectonics 1Dynamic Earth Chapter 3 Plate Tectonics 1
Dynamic Earth Chapter 3 Plate Tectonics 1Tom Jenkins
 
San Andreas Fault In California
San Andreas Fault In CaliforniaSan Andreas Fault In California
San Andreas Fault In CaliforniaGloria Moore
 
Seafloor Spread Research Paper
Seafloor Spread Research PaperSeafloor Spread Research Paper
Seafloor Spread Research PaperJennifer Wright
 
Contenental drift theory by Anurag Yadav
Contenental drift theory by Anurag YadavContenental drift theory by Anurag Yadav
Contenental drift theory by Anurag YadavAnuragsinghYadav3
 

Semelhante a Evidence... notes (20)

evidences_plate.ppt
evidences_plate.pptevidences_plate.ppt
evidences_plate.ppt
 
Continental drift
Continental driftContinental drift
Continental drift
 
Plate tectonics
Plate tectonicsPlate tectonics
Plate tectonics
 
Plate tectonics theory.docx
Plate tectonics theory.docxPlate tectonics theory.docx
Plate tectonics theory.docx
 
2012 updated plate tectonics new one use this one backup
2012 updated plate tectonics new one use this one backup2012 updated plate tectonics new one use this one backup
2012 updated plate tectonics new one use this one backup
 
Integ Sci 10 Lesson 1 [Autosaved].pptx
Integ Sci 10 Lesson 1 [Autosaved].pptxInteg Sci 10 Lesson 1 [Autosaved].pptx
Integ Sci 10 Lesson 1 [Autosaved].pptx
 
Plate tectonics
Plate tectonicsPlate tectonics
Plate tectonics
 
2013 updated plate tectonics new one use this one
2013 updated plate tectonics new one use this one2013 updated plate tectonics new one use this one
2013 updated plate tectonics new one use this one
 
Unit 1. 2. 2 continental drift
Unit 1. 2. 2 continental driftUnit 1. 2. 2 continental drift
Unit 1. 2. 2 continental drift
 
Plate Tectonics
Plate TectonicsPlate Tectonics
Plate Tectonics
 
2. Continental Drift.pptx
2. Continental Drift.pptx2. Continental Drift.pptx
2. Continental Drift.pptx
 
Plate tectonics
Plate tectonicsPlate tectonics
Plate tectonics
 
Plate Tectonics Essay
Plate Tectonics EssayPlate Tectonics Essay
Plate Tectonics Essay
 
Tectonics: Plate Tectonic Theory history
Tectonics: Plate Tectonic Theory historyTectonics: Plate Tectonic Theory history
Tectonics: Plate Tectonic Theory history
 
Time traveling alfred wegener essay
Time traveling alfred wegener essayTime traveling alfred wegener essay
Time traveling alfred wegener essay
 
Continental drift &and sea floor spreading
Continental drift &and sea floor spreadingContinental drift &and sea floor spreading
Continental drift &and sea floor spreading
 
Dynamic Earth Chapter 3 Plate Tectonics 1
Dynamic Earth Chapter 3 Plate Tectonics 1Dynamic Earth Chapter 3 Plate Tectonics 1
Dynamic Earth Chapter 3 Plate Tectonics 1
 
San Andreas Fault In California
San Andreas Fault In CaliforniaSan Andreas Fault In California
San Andreas Fault In California
 
Seafloor Spread Research Paper
Seafloor Spread Research PaperSeafloor Spread Research Paper
Seafloor Spread Research Paper
 
Contenental drift theory by Anurag Yadav
Contenental drift theory by Anurag YadavContenental drift theory by Anurag Yadav
Contenental drift theory by Anurag Yadav
 

Mais de Sells Middle School (20)

Topomaps
TopomapsTopomaps
Topomaps
 
Periodic table
Periodic tablePeriodic table
Periodic table
 
Atoms bonding
Atoms bondingAtoms bonding
Atoms bonding
 
Chemical reactions
Chemical  reactionsChemical  reactions
Chemical reactions
 
Atoms structure
Atoms structureAtoms structure
Atoms structure
 
The science behind the fun of mentos
The science behind the fun of mentosThe science behind the fun of mentos
The science behind the fun of mentos
 
Plate boundaries
Plate boundariesPlate boundaries
Plate boundaries
 
Plate Boundaries -Quick view
Plate Boundaries -Quick viewPlate Boundaries -Quick view
Plate Boundaries -Quick view
 
What is Topography
What is TopographyWhat is Topography
What is Topography
 
What are waves
What are wavesWhat are waves
What are waves
 
Checking... wave quest
Checking... wave questChecking... wave quest
Checking... wave quest
 
What is genetics
What is geneticsWhat is genetics
What is genetics
 
Spectrum
SpectrumSpectrum
Spectrum
 
Energy forms and_changes
Energy forms and_changesEnergy forms and_changes
Energy forms and_changes
 
Energy
EnergyEnergy
Energy
 
Light rays
Light raysLight rays
Light rays
 
The Life Of A Star
The Life Of A StarThe Life Of A Star
The Life Of A Star
 
Out Of This World
Out Of This WorldOut Of This World
Out Of This World
 
Momentum
MomentumMomentum
Momentum
 
Big Bang
Big BangBig Bang
Big Bang
 

Último

Prescribed medication order and communication skills.pptx
Prescribed medication order and communication skills.pptxPrescribed medication order and communication skills.pptx
Prescribed medication order and communication skills.pptxraviapr7
 
Clinical Pharmacy Introduction to Clinical Pharmacy, Concept of clinical pptx
Clinical Pharmacy  Introduction to Clinical Pharmacy, Concept of clinical pptxClinical Pharmacy  Introduction to Clinical Pharmacy, Concept of clinical pptx
Clinical Pharmacy Introduction to Clinical Pharmacy, Concept of clinical pptxraviapr7
 
Patient Counselling. Definition of patient counseling; steps involved in pati...
Patient Counselling. Definition of patient counseling; steps involved in pati...Patient Counselling. Definition of patient counseling; steps involved in pati...
Patient Counselling. Definition of patient counseling; steps involved in pati...raviapr7
 
Practical Research 1: Lesson 8 Writing the Thesis Statement.pptx
Practical Research 1: Lesson 8 Writing the Thesis Statement.pptxPractical Research 1: Lesson 8 Writing the Thesis Statement.pptx
Practical Research 1: Lesson 8 Writing the Thesis Statement.pptxKatherine Villaluna
 
The basics of sentences session 10pptx.pptx
The basics of sentences session 10pptx.pptxThe basics of sentences session 10pptx.pptx
The basics of sentences session 10pptx.pptxheathfieldcps1
 
UKCGE Parental Leave Discussion March 2024
UKCGE Parental Leave Discussion March 2024UKCGE Parental Leave Discussion March 2024
UKCGE Parental Leave Discussion March 2024UKCGE
 
Patterns of Written Texts Across Disciplines.pptx
Patterns of Written Texts Across Disciplines.pptxPatterns of Written Texts Across Disciplines.pptx
Patterns of Written Texts Across Disciplines.pptxMYDA ANGELICA SUAN
 
What is the Future of QuickBooks DeskTop?
What is the Future of QuickBooks DeskTop?What is the Future of QuickBooks DeskTop?
What is the Future of QuickBooks DeskTop?TechSoup
 
Ultra structure and life cycle of Plasmodium.pptx
Ultra structure and life cycle of Plasmodium.pptxUltra structure and life cycle of Plasmodium.pptx
Ultra structure and life cycle of Plasmodium.pptxDr. Asif Anas
 
How to Manage Cross-Selling in Odoo 17 Sales
How to Manage Cross-Selling in Odoo 17 SalesHow to Manage Cross-Selling in Odoo 17 Sales
How to Manage Cross-Selling in Odoo 17 SalesCeline George
 
Philosophy of Education and Educational Philosophy
Philosophy of Education  and Educational PhilosophyPhilosophy of Education  and Educational Philosophy
Philosophy of Education and Educational PhilosophyShuvankar Madhu
 
Practical Research 1 Lesson 9 Scope and delimitation.pptx
Practical Research 1 Lesson 9 Scope and delimitation.pptxPractical Research 1 Lesson 9 Scope and delimitation.pptx
Practical Research 1 Lesson 9 Scope and delimitation.pptxKatherine Villaluna
 
Education and training program in the hospital APR.pptx
Education and training program in the hospital APR.pptxEducation and training program in the hospital APR.pptx
Education and training program in the hospital APR.pptxraviapr7
 
How to Add Existing Field in One2Many Tree View in Odoo 17
How to Add Existing Field in One2Many Tree View in Odoo 17How to Add Existing Field in One2Many Tree View in Odoo 17
How to Add Existing Field in One2Many Tree View in Odoo 17Celine George
 
Diploma in Nursing Admission Test Question Solution 2023.pdf
Diploma in Nursing Admission Test Question Solution 2023.pdfDiploma in Nursing Admission Test Question Solution 2023.pdf
Diploma in Nursing Admission Test Question Solution 2023.pdfMohonDas
 
P4C x ELT = P4ELT: Its Theoretical Background (Kanazawa, 2024 March).pdf
P4C x ELT = P4ELT: Its Theoretical Background (Kanazawa, 2024 March).pdfP4C x ELT = P4ELT: Its Theoretical Background (Kanazawa, 2024 March).pdf
P4C x ELT = P4ELT: Its Theoretical Background (Kanazawa, 2024 March).pdfYu Kanazawa / Osaka University
 
AUDIENCE THEORY -- FANDOM -- JENKINS.pptx
AUDIENCE THEORY -- FANDOM -- JENKINS.pptxAUDIENCE THEORY -- FANDOM -- JENKINS.pptx
AUDIENCE THEORY -- FANDOM -- JENKINS.pptxiammrhaywood
 
Benefits & Challenges of Inclusive Education
Benefits & Challenges of Inclusive EducationBenefits & Challenges of Inclusive Education
Benefits & Challenges of Inclusive EducationMJDuyan
 

Último (20)

Prescribed medication order and communication skills.pptx
Prescribed medication order and communication skills.pptxPrescribed medication order and communication skills.pptx
Prescribed medication order and communication skills.pptx
 
Clinical Pharmacy Introduction to Clinical Pharmacy, Concept of clinical pptx
Clinical Pharmacy  Introduction to Clinical Pharmacy, Concept of clinical pptxClinical Pharmacy  Introduction to Clinical Pharmacy, Concept of clinical pptx
Clinical Pharmacy Introduction to Clinical Pharmacy, Concept of clinical pptx
 
Patient Counselling. Definition of patient counseling; steps involved in pati...
Patient Counselling. Definition of patient counseling; steps involved in pati...Patient Counselling. Definition of patient counseling; steps involved in pati...
Patient Counselling. Definition of patient counseling; steps involved in pati...
 
Practical Research 1: Lesson 8 Writing the Thesis Statement.pptx
Practical Research 1: Lesson 8 Writing the Thesis Statement.pptxPractical Research 1: Lesson 8 Writing the Thesis Statement.pptx
Practical Research 1: Lesson 8 Writing the Thesis Statement.pptx
 
The basics of sentences session 10pptx.pptx
The basics of sentences session 10pptx.pptxThe basics of sentences session 10pptx.pptx
The basics of sentences session 10pptx.pptx
 
UKCGE Parental Leave Discussion March 2024
UKCGE Parental Leave Discussion March 2024UKCGE Parental Leave Discussion March 2024
UKCGE Parental Leave Discussion March 2024
 
Patterns of Written Texts Across Disciplines.pptx
Patterns of Written Texts Across Disciplines.pptxPatterns of Written Texts Across Disciplines.pptx
Patterns of Written Texts Across Disciplines.pptx
 
What is the Future of QuickBooks DeskTop?
What is the Future of QuickBooks DeskTop?What is the Future of QuickBooks DeskTop?
What is the Future of QuickBooks DeskTop?
 
Ultra structure and life cycle of Plasmodium.pptx
Ultra structure and life cycle of Plasmodium.pptxUltra structure and life cycle of Plasmodium.pptx
Ultra structure and life cycle of Plasmodium.pptx
 
Prelims of Kant get Marx 2.0: a general politics quiz
Prelims of Kant get Marx 2.0: a general politics quizPrelims of Kant get Marx 2.0: a general politics quiz
Prelims of Kant get Marx 2.0: a general politics quiz
 
How to Manage Cross-Selling in Odoo 17 Sales
How to Manage Cross-Selling in Odoo 17 SalesHow to Manage Cross-Selling in Odoo 17 Sales
How to Manage Cross-Selling in Odoo 17 Sales
 
Philosophy of Education and Educational Philosophy
Philosophy of Education  and Educational PhilosophyPhilosophy of Education  and Educational Philosophy
Philosophy of Education and Educational Philosophy
 
Practical Research 1 Lesson 9 Scope and delimitation.pptx
Practical Research 1 Lesson 9 Scope and delimitation.pptxPractical Research 1 Lesson 9 Scope and delimitation.pptx
Practical Research 1 Lesson 9 Scope and delimitation.pptx
 
Education and training program in the hospital APR.pptx
Education and training program in the hospital APR.pptxEducation and training program in the hospital APR.pptx
Education and training program in the hospital APR.pptx
 
How to Add Existing Field in One2Many Tree View in Odoo 17
How to Add Existing Field in One2Many Tree View in Odoo 17How to Add Existing Field in One2Many Tree View in Odoo 17
How to Add Existing Field in One2Many Tree View in Odoo 17
 
Finals of Kant get Marx 2.0 : a general politics quiz
Finals of Kant get Marx 2.0 : a general politics quizFinals of Kant get Marx 2.0 : a general politics quiz
Finals of Kant get Marx 2.0 : a general politics quiz
 
Diploma in Nursing Admission Test Question Solution 2023.pdf
Diploma in Nursing Admission Test Question Solution 2023.pdfDiploma in Nursing Admission Test Question Solution 2023.pdf
Diploma in Nursing Admission Test Question Solution 2023.pdf
 
P4C x ELT = P4ELT: Its Theoretical Background (Kanazawa, 2024 March).pdf
P4C x ELT = P4ELT: Its Theoretical Background (Kanazawa, 2024 March).pdfP4C x ELT = P4ELT: Its Theoretical Background (Kanazawa, 2024 March).pdf
P4C x ELT = P4ELT: Its Theoretical Background (Kanazawa, 2024 March).pdf
 
AUDIENCE THEORY -- FANDOM -- JENKINS.pptx
AUDIENCE THEORY -- FANDOM -- JENKINS.pptxAUDIENCE THEORY -- FANDOM -- JENKINS.pptx
AUDIENCE THEORY -- FANDOM -- JENKINS.pptx
 
Benefits & Challenges of Inclusive Education
Benefits & Challenges of Inclusive EducationBenefits & Challenges of Inclusive Education
Benefits & Challenges of Inclusive Education
 

Evidence... notes

  • 1. Evidence for Continental Drift and The Theory of Plate Tectonics
  • 2. Did you know that the coal that is mined in Pennsylvania was actually formed from tropical plant life near the Equator? How did it travel northward to Pennsylvania? Scientists believe that 200 million years ago, when the dinosaurs dined upon tropical ferns and tall tropical vegetation, what is now Pennsylvania was at a different location, namely the equatorial region.
  • 3. 1. Alfred Wegener was the first scientist to suggest that the fit of the continents of South America and Africa may not be a coincidence. He thought that the continents may have been together at some point in the past. He called this “supercontinent” Pangaea (this means “all land”).
  • 4. 2. In 1912, he proposed the theory of continental drift, which means that the continents have moved to their current locations.
  • 5. 3. Besides the “puzzle-like” fit of some of the continents, there is substantial rock & fossil evidence to support Wegener’s theory:
  • 6. a. Like animal fossils have been found oceans apart.
  • 8. b. Fossils of the same green plants have been found on almost all continents, suggesting that they all once had a similar climates.
  • 9. c. Additionally, fossils of tropical plants have been found on islands in the Arctic Ocean, suggesting that area may have been much warmer in the past.
  • 10. d. Glacial deposits and weathered rock (scientists think this from moving ice) have been found on South America, Africa, India, and Australia. This could mean that these lands were once cold enough for glaciers to form and eventually move around on the land.
  • 11. e. Similar rock structures are found on different continents. For example, mountains in the United States are similar to ones found on Greenland and in Europe. Also, rocks in South America and Africa are very similar.
  • 12. 4. The discovery of sea-floor spreading on the ocean’s floors has given Wegener’s theory of continental drift more support.
  • 14. a. In the 1950’s, it was found that the ocean floors have mountains, valleys, and ridges, just like the land on earth.
  • 15. b. It was suggested (and later agreed upon) that these formations have been caused by magma from the mantle being pushed up through the crust. Then, it flows to each side as the process repeats. http://www.wwnorton.com/earth/egeo/animations/ch2.htm (Sea Floor Spreading)
  • 16. c. This idea was supported by the dating of rock found along the ocean’s ridges. The youngest rocks are found right along the ocean’s ridges. The ages of the rocks becomes increasingly older as you move away from the ridges. http://www.wwnorton.com/college/geo/earth2/home.asp#animations (Click on animation to the right)
  • 17. This map shows the ages of the rocks that make up the floor of the Atlantic Ocean. Red represents the youngest rocks; the deepest red marks the Mid-Oceanic Ridge, where continental plates are pulling apart and new crust is being formed. Older rocks are yellow, green, and blue.
  • 18. 5. Also supporting the idea of seafloor spreading are clues from the earth’s magnetic poles.
  • 19. a. Think of the earth having a giant magnet in its core.
  • 20. b. This creates a north and a south poles on earth. We evidence of these poles when we use a compass.
  • 21. c. Anyhow, scientists theorize that these poles have reversed several times over the lifespan of the earth. This is supported by the discovery of patterns in iron containing minerals and rocks (remember, iron is magnetic). Magnetic rocks are “attracted” to the north pole, so they are pulled towards it, and away from the south pole.
  • 23. Interesting…Our planet's magnetic field reverses about once every 200,000 years on average. However, the time between reversals is highly variable. The last time Earth's magnetic field flipped was 780,000 years ago, according to the geologic record of Earth's polarity.
  • 24. d. When the iron-containing material on earth is studied, it shows that this pattern has changed over time. This is especially apparent on the oceans’ floor.
  • 25. e. Did you know that the magnetic north on earth is still wandering? The magnetic pole is currently 966 km (600 miles) from the geographic one.
  • 27. 6. All of this scientific work has led scientists to the theory of plate tectonics, which states that the earth’s crust is broken in to sections which move around (or float) on the mantle below. It is this theory that helps to explain how the earth’s surface has changed and will continue to change over time.
  • 28. So what will the earth look like in the future? We can only guess…
  • 29. So what will the earth look like in the future? We can only guess…