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Continental Drift

TermDefinition
Continental Drift Theory The idea that Earth's continents moved apart from a single large continent called Pangaea.
Plate Tectonics The theory that accepted the Continental Drift Theory in the 1960s
Glacial Evidence -Glacial deposits formed around 300 mya are found in Antarctica, Africa, South America, India, and Austrailia. -Striations (scratches on rocks) show the ice flowing from the glaciers came from one single point. -Evidence of glaciers is found in wrm clim
Fossil Evidence -Fossils of the same species were found on separate continents and nowhere else. -These plants and animals would have has to evolve independently or swim the distances. -Fossils found didn't fit the climate (Palm tree leaf fossils were found in Alaska.)
Pangaea -Was a super continent -Began to break apart about 175 million years ago -There were probably other supercontinents before Pangaea. -The Earth's continents have been continually breaking apart and coming together.
Laurasia and Gondwanaland -Gondwanaland separated from Laurasia between 200-180 million years ago. -This roughly formed the northern and southern hemispheres.
Examples of Fossil Evidence -Glossopteris (Fern) -Mesosaruas -Lystrosaurus -Cynognathus
Continental Fit -The continents, particularly South America and Africa, fit together like puzzle pieces. -This was more evidence that the continents were once joined.
Continents -The world's main contiguous expanses of land -Africa, Asia, Australia, Antarctica, Europe, South America, and North America
Alfred Wegener -Proposed the Continental Drift Theory -Despite large amounts of fossil and rock evidence, his theory was rejected by other scientists. -He couldn't explain how the other continents moved -His work wasn't recognized until the 1960s
Land forms/Rock Layers Evidence -The Appalachian Mtns. matched well with the British Isles as well as other places. -Similar types and ages of rocks were found on Africa, North America, and Europe, among other places. -The coal fields in North America and Europe match up.
Created by: aclubb
 

 



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