2. Continental Drift
It is the theory that 200 million years ago
there was a single continent called Pangea on
the Earth
The Earth, s rotation caused this landmass to
move and break up. The huge pieces of rock
produced are tectonic plates. They are like
massive pieces of a jigsaw puzzle.
3.
4. These tectonic plates move extremely
slowly
• When two plates collide, • The places where plates
one can rise and form a meet are very unstable
mountain range. The other areas that can produce
can sink under the ocean volcanoes and earthquakes.
and form an oceanic trench
5. QUIZ
1. What is the theory of continental drift?
1. What happens when tectonics plates collide?
6. SOLUTIONS
1.Continental drift is the theory that 200 years
ago there was a single continent on Earth:
Pangea
2.In the case of two plates colliding, one may
rise up and form a mountain range, while the
other may sink to form an oceanic trench.
7. ACTIVITIES
MAP P.27
1. Where are the most unstable places in the
world? Where are the more stable places?
2. Which areas of Spain are the most unstable?
8. SOLUTIONS
1. The most unstable areas of the Earth are
those which coincide with the points where
tectonic plates are in contact. The most
stable are those found in the middle of
tectonic plates, far from their edges.
2. Andalusia and Catalonia are the most
geographically unstable regions of Spain.
Both, particularly Andalusia are close to the
point where the African and Eurasian plates
meet.
9. ACTIVITY 3
PAGE 27
a) The Earth´s structure consists of three large
sections: the core, the mantle and the crust
b) The mantle is 84% of the Earth´s total volume
c) The Earth´s crust is between 10 and 70
kilometers thick.
d) Mount Everest is the highest point in the
world at 8848 metres
