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Theory of Continental Drift
All the continents were once joined into a ‘Super Continent’ known as PANGAEA This continent has since broken up into the 7 continents we know today Proposed by Alfred Wegener German scientist – 1912 Not accepted by scientific community until 1930’s
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C’mon Rex…you can do it! Jump boy…jump!
ESRT pg. 9 C’mon Rex…you can do it! Jump boy…jump! Hurry Rex!
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Continental Drift Evidence
The Continents of the Earth seem to fit together like a jigsaw puzzle
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Glacial Striations found on edges of continents…where continents were thought to have been joined together
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Evidence: Ancient Climates
Geologists had found glacial till of the same age on several continents.
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Fossil Evidence Shows that certain species were only found in specific areas…they match up if continents joined Glossopteris Mesosaurus
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match up on different continents. Rock types match.
Mountain Ranges match up on different continents. Rock types match.
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What Pangaea might have looked like.
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Earth’s Tectonic Plates
The Earth’s crust and upper mantle are broken into sections called plates
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ESRT – Plate Tectonics pg 5
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How do the Earth’s Plates move?
Convection currents of HOT magma under the Lithosphere push the plates around The plates ‘ride’ on the magma like rafts
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