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Page 1: Continental Drift Drifting Continents Continental drift is the idea that continents are moving very slowly, parallel to Earth’s surface. Alfred Wegener

Continental Drift

Page 2: Continental Drift Drifting Continents Continental drift is the idea that continents are moving very slowly, parallel to Earth’s surface. Alfred Wegener

Drifting Continents

• Continental drift is the idea that continents are moving very slowly, parallel to Earth’s surface.

• Alfred Wegener proposed that the continents slowly drifted to their present-day locations over millions of years.

4.1 Continental Drift

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Page 3: Continental Drift Drifting Continents Continental drift is the idea that continents are moving very slowly, parallel to Earth’s surface. Alfred Wegener

Pangaea

• Approximately 255 million years ago, the continents were one big landmass named Pangaea.

4.1 Continental Drift

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Page 4: Continental Drift Drifting Continents Continental drift is the idea that continents are moving very slowly, parallel to Earth’s surface. Alfred Wegener

Evidence for Continental Drift

• Four major pieces of evidence:

1. Fit of Continents

2. Fossil Evidence

3. Rock types and mountain ranges

4. Climate evidence

4.1 Continental Drift

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Page 5: Continental Drift Drifting Continents Continental drift is the idea that continents are moving very slowly, parallel to Earth’s surface. Alfred Wegener

1. Fit of the Continents• Africa and South America fit together like a

puzzle.

http://en.wikipedia.org/wiki/Image:Pangea_animation_03.gif
Page 6: Continental Drift Drifting Continents Continental drift is the idea that continents are moving very slowly, parallel to Earth’s surface. Alfred Wegener

2. Fossil Evidence

4.1 Continental Drift

• Wegener used fossil evidence from a fossil of a fern called Glossopteris.

Page 7: Continental Drift Drifting Continents Continental drift is the idea that continents are moving very slowly, parallel to Earth’s surface. Alfred Wegener

3. Rock Types and Mountain Ranges• Ancient rocks on the continents match up when you

assemble the continents as Pangaea.

4.1 Continental Drift

• Some mountain ranges appear as if they were once connected.

Page 8: Continental Drift Drifting Continents Continental drift is the idea that continents are moving very slowly, parallel to Earth’s surface. Alfred Wegener

4. Climate Evidence

• Sedimentary rocks record clues about climate.

• The ancient climate of certain locations was very different from the present-day climate.

– Tropical plants in Greenland, glaciers in Africa

4.1 Continental Drift

Page 9: Continental Drift Drifting Continents Continental drift is the idea that continents are moving very slowly, parallel to Earth’s surface. Alfred Wegener

Hypothesis Rejected• Wegener proposed that the same forces of gravity that

produced tides moved the continents.

• Scientists rejected this hypothesis because they did not accept Wegener’s explanation of how the continents moved.

• New technology gathered additional evidence that supported the continental drift theory. (p.172)

4.1 Continental Drift

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