Power Point Presentation realizada como parte de una unidad integrada rrealizada desde las áreas de Ciencias Naturales y Ciencias Sociales para 1º ESO.IES Al-Iscar.

1. Hurricanes

2. What are Hurricanes?
• Hurricanes are
intense
tropical
cyclones with
a maximum
speed of at
65 knots
(74mph).

3. By Any Other Name
In the Eastern Pacific they
are called typhoons.
In the Indian Ocean they’re
called cyclones.

4. How are they formed?
Hurricanes gather
heat and energy
through contact
with warm ocean
waters.
Evaporation from
the seawater
increases their
power.

5. Hurricanes rotate
in a counterclockwise
direction around
an "eye" in the
Northern
Hemisphere and
clockwise
direction in the
Southern
Hemisphere.

6. Physical Make-up
• Hurricanes
have a
diameter of
less than 100
miles to over
500 miles.

7. When does hurricane season
start?
The Atlantic
hurricane season
is from June 1 to
November 3.0

8. Hurricane Power
• Hurricanes
are ranked
on a 1-5 scale
called the
SaffirSimpson
Scale.

9. Hurricane Power
• A 1 would be a
minimal
hurricane with
winds 74-95
mph.
• A 5 is
catastrophic
with winds 155
mph+

10. Danger from Hurricanes
• In the US,
most people
that die from
hurricanes are
killed by fresh
water
flooding.

11. Danger from Hurricanes
• Worldwide,
most die
from the
storm
surge.

12. Storm Surge
• To Answer that question let’s
take a look at storm surge.

13. THE WIND!
• Flying
objects in
the wind can
be very
dangerous.

14. THE WIND!
• Take a look
at this piece
of wood that
was driven
into the palm
tree.

15. Some historical
hurricanes
• Hurricane
Kenna2002
• Katrina2005
• Ernesto2012

16. Tornadoes.

17. What is a tornado?
A tornado is a
violent
rotating
column of air
extending
from a
thunderstorm
to the ground

18. Tornadoes power
The most violent
tornadoes can
cause a
tremendous
destruction
with wind
speeds of up to
300 mph.

19. Tornadoes power
They can destroy
large buildings,
uproot trees
and hurl
vehicles
hundreds of
yards.

20. How do tornadoes form?
Most tornadoes form
from thunderstorms.
You need warm, moist
air from the Gulf of
Mexico and cool, dry
air from Canada.
When these two air
masses meet, they
create instability in
the atmosphere.

21. What do tornadoes look like?
Tornadoes can
appear as a
traditional
funnel shape, or
in a slender
rope-like form.

22. When are tornadoes most
likely to occur?
Tornadoes can
happen at any
time of the
year and at
any time of
the day.

24. Volcanoes

25. What is a ?
A volcano is a mountain
that forms when magma
reaches the surface of
the Earth.
Magma rises because it is
less dense than the solid
rock around it.

26. What causes volcanoes?
Tectonic Plate Boundaries

27. A volcano erupts when
magma and gases find a
way to escape, so they
burst to the surface
through a vent. An
eruption can be quite
gentle or very violent.

28. Types of volcano
Volcanoes can be active, dormant or extinct.
• A volcano is active, or alive, when it erupts often.
•
When a volcano is dormant, or sleeping, it has not
erupted for a long time – but it might in the future.
• A volcano is extinct, or dead, when it hasn’t erupted
for at least 100,000 years.

30. Parts of volcanoes
Crater – a deep hollow at the
top of a volcano.
Lava – melted rock that flows
down the volcano.
Magma – melted rock inside the
Earth.
Vent – a crack on the side of a
volcano where magma can
escape

31. Volcanic Effects
•
•
•
•
•
•
Pyroclastic flow
Lahars/Mud flows
Pyroclastic fall
Lava flow
Noxious Gas
Earthquakes

32. Volcanic Fatalities
• 92,000 Tambora,
Indonesia 1815.
• 36,000 Krakatau,
Indonesia 1883.
• 29,000 Mt Pelee,
Martinique 1902.
• 15,000 Mt
Unzen, Japan
1792.

33. Pyroclastic Flow
• For example,
eruption of Vesuvius
in 79 AD destroyed
the city of Pompeii.