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Waves

Plate Tectonics - History.

It is believed that there was once a single land mass called Pangaea,
(pronounced "pan-jee-er", from Greek 'all-earth').
This land mass split and separated as the plates drifted on the mantle.

The evidence for this theory comes from

1) Rocks each side of the Mid-Atlantic ridge
show identical magnetic orientation, see Sea-floor spreading.
This is the clearest evidence for continental drift.

2) Today's continents can be pieced together.
South America fits very neatly alongside Africa.

3) Similar fossils of the same age are found
in different parts of the world,
suggesting that these land masses were connected in the past.

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Copyright © 2008 Dr. Colin France. All Rights Reserved.