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Plate Tectonics
Many years ago
scientists thought
the surface
However weof the
now
earth
knowwas
that uneven
because of the
continental drift is
shrinkage
the cause when
of the
the earth cooled.
furrowed crust of
the earth. Alfred
Wegener came
across this theory…read more

Slide 3

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Wegener's Theory
Alfred Wegener
After further
came across similar
fossils and rock
investigation he
layers at
realised different
that the
sides of
different the oceans.
continents
South American and
also fitted
Africa beingtogether
the two
like a jigsaw.
continents that fit
together best. This
gave him the
continental drift
idea.…read more

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However ..
Many other
scientists and
geologists said
his theory was
It impossible,
wasn't until this
the is
1960s when
because
scientists
Wegener'sactually
theory
believed him.
wasn't very
Sadly he died
convincing.
before this theory
was accepted.…read more

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Earths Structure
The Earth has a
crust, mantle,
The crust
outer and can be
inner
approximately
core.
The mantle is a
7km toHere
solid. 20km radio
thick.
active decay
takes place
At centre of
producing lots of
the earth there
heat. ThisIts
is a core. causes
convection
made of iron
currents.
and nickel.…read more

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