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.
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.
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.
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.
29.
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