478953
Wegener's Theory
- The idea of Continental Drift was put forward by Alfred
Wegener in 1915
- His fellow scientists found his
theories hard to accept
- He couldn't explain how the
continents had moved
- He couldn't explain how the
continents had moved
- His theory was shown to be right
almost 50 years later
- Scientists found that the seas floor is
spreading apart in some places, where
molten rock is spewing out between
two continents
- This led to a new theory called plate
tectonics
- This led to a new theory called plate
tectonics
- Proof for his
theory
- The same
types of fossilised
animals and plants are
found in South America
and Africa
- The shape of the east
coast of South America
fits the west coast of
Africa, like pieces in a
jigsaw puzzle
- Matching rock formations
and mountain chains are
found in South America
and Africa
- The same
types of fossilised
animals and plants are
found in South America
and Africa
- Scientists found that the seas floor is
spreading apart in some places, where
molten rock is spewing out between
two continents
- His fellow scientists found his
theories hard to accept
- In the past scientists thought that mountain ranges
were caused by the Earth's crust shrinking as the
early molten earth cooled
- Wegener suggested the mountains were
formed when the edge of a drifting continent
collided with another, causing it to crumple and
fold.
- For example, the Himalayas were formed
when India came into contact with Asia.
- For example, the Himalayas were formed
when India came into contact with Asia.
- Wegener suggested the mountains were
formed when the edge of a drifting continent
collided with another, causing it to crumple and
fold.
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