the theory of continental driftmrsweisenbachsra.weebly.com/.../continental_drift.pdf · continental...
TRANSCRIPT
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The Theory of Continental Drift
Continental Drift Discovery
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The World
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ALFRED WEGENER THEORY OF CONTINENTAL
DRIFT Found evidence for PANGAEA and proposed the theory of continental drift.
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Continental Drift (p95 red book, 182 in Sciencesaurus)
• Theory that continents were once part of a single landmass that broke apart and have moved to their present locations.
• can drift apart from one another and have done so in the past
For more information about what the continents looked like throughout the Earth’s History go to: htttp://www.ucmp.berkeley.edu/geology/anim1.html
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Pangaea
Pangaea is the name given to the single landmass that was present 200 million years ago
Can you name the continents in Pangaea? http://kids.earth.nasa.gov/archive/pangaea/Pangaea_game.html
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Continents “fit together” like puzzle pieces
WEGENER’S EVIDENCE
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WEGENER’S EVIDENCE
Fossil Evidence • fossils are remains of living things that lived long ago. • similar fossils have been discovered in matching coastlines on different continents.
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WEGENER’S EVIDENCE
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WEGENER’S EVIDENCE
• Mountains – Some mountain ranges on different continents
seem to match. • Ex: ranges in Canada match Norway and Sweden • Ex: Appalachian Mtn. match UK mtn
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WEGENER’S EVIDENCE
• Climatic evidence such as glaciers in areas that are now close to the Equator
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Satellites used to measure the movement of continents
• Laser Geodynamics Satellite (LAGEOS)
Evidence of Continental Drift