21323966
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Mind Map by charlie miller, updated more than 1 year ago
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Alfred Wegener's Theory of Continental Drift
- Wasn't excepted because...
- Movement wasn't detectable.
- He wasn't a geologist, he was
a meteorologist.
- It was just after the war and Wegener was German.
- His possible explanations on why drifting
happened were deemed impossible.
- Movement could be caused by...
- The Earth's rotation.
- Tidal forces.
- The Earth's rotation.
- Movement could be caused by...
- Movement wasn't detectable.
- It explained...
- Why similar fossils of
plants and animals had
been found on opposite
sides of the Earth.
- Mountain building which happened
when continents smashed together.
- Why similar fossils of
plants and animals had
been found on opposite
sides of the Earth.
- Instead it was believed...
- Continents used to be linked by land bridges.
- Continents used to be linked by land bridges.
- His theory...
- Africa and South America had been
one continent which then split.
- 300 years ago there was a
supercontinent called Pangaea.
- The continents are moving apart.
- Africa and South America had been
one continent which then split.
- It was proven correct in the end because...
- In the 1950's, scientists investigated
the Mid-Atlantic Ridge.
- Evidence that magma rises up through the
sea floor, solidifies and forms underwater
mountains that are roughly symmetrical
either side of the ridge was found.
- This suggested that the sea floor was spreading.
- This suggested that the sea floor was spreading.
- Evidence that magma rises up through the
sea floor, solidifies and forms underwater
mountains that are roughly symmetrical
either side of the ridge was found.
- Magnetic orientation of the rocks.
- As liquid magma erupts out of the gap, iron particles in the rocks tend to align themselves with the Earth's magnetic field.
- As liquid magma erupts out of the gap, iron particles in the rocks tend to align themselves with the Earth's magnetic field.
- In the 1950's, scientists investigated
the Mid-Atlantic Ridge.
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