continental drift and the story of pangaea. learning activity 2ab unit b: the dynamic earth learning...
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Continental Drift and The Story of Pangaea
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Learning Activity 2ab Unit B: The Dynamic Earth
Learning Target:I can describe Wegener’s evidence for continental drift (DOK1)I can identify weaknesses in Wegener’s ideas and why continental drift was not accepted by the scientific community (DOK1)
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Essential Question
How and why have our ideas of plate movement changed through time (past and
present) and what evidence do we have for our changing ideas?
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Alfred Wegener
• In 1912, Alfred Wegener proposed the idea of “Continental Drift”
• Continental Drift states that continents have slowly moved over the Earth’s surface
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Pangaea
• Wegener believed that all continents were once connected in one large continent called “Pangaea”
• Pangaea broke apart 200 million years ago and the continents drifted to their present locations.
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The Theory of Continental Drift
• Complete the concept map.
Continental drift
Landforms
Fossils
Climate
Is supported by evidence from
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Wegener used 3 types of evidence
1. Evidence from landforms- Mountain ranges line up in Africa and South America- European coalfields line up with similar fields in North America- Continents fit together like a puzzle
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2. Evidence from fossils - Fossils of the same species have been found
in places now separated by oceans
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3. Evidence from climate -Fossils of warm climate creatures have been
found in ice-covered places
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• Wegener’s theory was not widely accepted until the 1960’s because he could not provide a satisfactory explanation for the forces that push or pull the continents
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Check for Understanding
Write a paragraph summarizing the main ideas of continental drift.