continental
DESCRIPTION
Continental. Drift. Inside Earth 1.3 Pages 28-32 . Alfred Wegener. Proposed a super continent he called Pangaea (“All Earth”) Called his hypothesis Continental Drift Wrote the Origins of the Continents & Oceans 1915. Layers of Earth Menu. Continental Drift. - PowerPoint PPT PresentationTRANSCRIPT
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Continental
Inside Earth 1.3Pages 28-32
Drift
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• Proposed a super continent he called Pangaea (“All Earth”)
• Called his hypothesis Continental Drift– Wrote the Origins of the
Continents & Oceans 1915.
Alfred Wegener
Layers of
Earth Menu
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• All continents were once together and have slowly drifted, over time, to their current locations– Pieces of Evidence:
Continental Drift
Fit of the Continents
Landforms Climatic Evidence
Fossil Evidence
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• The coast of S. America and Africa fit together like a puzzle
• N. America and Africa
• The Red Sea.
Fit of the Continents
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World Map/ CD Evidence
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Landforms• Mountain features– South African Mt. ranges line up with a mountain
range in Argentina– European coal fields line up with coal fields of
North America.
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• Fossil: trace of an organism preserved in rock– Mesosaurus and Lystrosaurus: reptiles that could
not swim across a salty ocean– Found in places now separated by oceans which
suggest that the continents were connected.
Fossils
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• Glossopteris: a tropical fernlike plant– Found in cooler climates of today, suggest that
the continents have since moved– Seeds were too large to be carried by wind.
Fossils
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• Fossils of tropical plants were found on the island of Spitsbergen, which is in the Arctic Ocean– A harsh, polar climate
covered with ice– 300 million years ago, the
island had a warm and mild climate
– Wegener believed it was closer to the equator.
ClimateClimate
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• Glacial Evidence found as deep scratches in rocks on South Africa– The climate of S. Africa today is too mild– Suggests that S. Africa was closer to the S. Pole
Climate
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• Wegener believed that the climates changed because the position of these places changed– The continent carries the fossil and rock evidence
from where it formed and provide evidence for CD.
Climate
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Rejected?
• Wegener could not provide a satisfactory explanation for the force that pushes or pulls the continents– Geologists rejected his idea until the 1960’s
CD RiftEvidence
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• Read textbook pages 28-32• Answer Section Review questions 1-4
Due: Friday, September 28th
What to Work On