6.2 Pests of Sesame_Identification_Binomics_Dr.UPR
Unit 3 rock slides
1.
2. Intrusive: Rocks formed deep inside Earth
Formed from magma
Cool very slowly
Have large crystals
3. Extrusive: Rocks formed on or near Earth’s
surface
Formed from lava
Cool very rapidly
Have small or no crystals
4.
5. Felsic:
Light or red in color
Usually Lower
density
High content of
aluminum
Mafic:
Dark or green in color
Usually Higher
Density
High content of iron
or magnesium
17. • Definition:
– Small, solid pieces of material that
come from rocks or living things
like leaves, shells, etc.
18. Clastic
Formed from various rock fragments
Deposited by water, wind, glaciers
Classified by grain size and shape
Formed from Cementation or Compaction
19.
20. Grain Size and Shape
Texture Grain Size Composition Comments Rock Name
Inorganic Land-Derived
Clastic
Pebbles, cobbles,
and/or boulders
embedded in sand, silt
and/or clay
Mostly quartz,
feldspar, and clay
minerals; may
contain fragments of
other rocks and
minerals
Rounded fragments Conglomerate
Angular fragments Breccia
Sand (0.2 to 0.006 cm) Fine to course grained Sandstone
Silt (0.006 to 0.0004
cm) Very fine grained Siltstone
Clay (less than 0.0004
cm)
Compact, cannot see
individual grains Shale
21. Chemical
Formed when minerals dissolved in water crystalize
Think back to salt crystal lab
Crystalline
(Chemical)
Fine-grained;
crystals from
chemical
precipitates and
evaporates
Halite
Softer than a
fingernail, will not
react with acid, salt Rock Salt
Gypsum
Softer than a
fingernail, will not
react with acid Rock Gypsum
Calcite
Carbonate: will react
with acid Limestone
22. Organic Sedimentary Rock
Forms where the remains of plants & animals are
deposited
Bioclastic
(Organic)
Fine to course Calcite
Made of shells,
will react with
acid Coquina
Fine-grained Carbon
Dark in color;
made from plant
remains Coal
25. The term "metamorphic"
means "to change form.“
These rocks have been put
under high pressure and
temperatures
They are not melted in this
process, instead new
minerals and physical make
up change
26. There are two types of
metamorphic rocks.
Each is classified
according to its
composition and
texture.
Foliated
Nonfoliated.
27. FOLIATED metamorphic
rocks are those in which the
minerals have been
flattened and pushed into
layers
Examples of foliated rocks
are slate, and gneiss.
28.
29. NON-FOLIATED metamorphic rocks
do not display layers. Rather, they are
massive structures with no obvious
banding.
The mineral grains grow and
rearrange, but they don’t form
layers.
A good example of non-foliated rock is
quartzite or Marble
30.
31. Metamorphism can
occur in different
degrees
The crystals can
rearrange themselves
without being melted
A metamorphic rock
can go through
metamorphism