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Alfred Wegener

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Theory that all the continents had once been joined as a ... Evidence from Climate History. Glacial deposits found in Africa, India, South America, Australia ... – PowerPoint PPT presentation

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Title: Alfred Wegener


1
Alfred Wegener
  • In 1912, this German Scientist presented his
    idea about continental movement.
  • No one believed him.

His hypothesis was called CONTINENTAL DRIFT
2
What is continental drift?
  • Theory that all the continents had once been
    joined as a single landmass - a supercontinent.
  • 200 million years ago
  • Pan All
  • Gaea Earth

3
Early Observations
  • We can combine evidence and data from all
    scientific worlds and then patterns start to form

4
Evidence from Shapes
  • - The continents shapes match up like a puzzle
    in some places

5
PANGAEA
6
Evidence from Rocks
  • Our Appalachian Mountains share the same geology
    as the mountains in Greenland Europe

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8
Evidence from Fossils
  • Land animals that couldnt have swum across the
    ocean
  • Fresh water reptiles that couldnt have swum
    across the SALTY ocean water
  • Plant fossils that are from tropical plants that
    are now found in arctic places

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10
Evidence from Climate History
  • Glacial deposits found in Africa, India, South
    America, Australia
  • Coal layers found in Antarctica

COLD
Swampy HOT
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14
2 unanswered questions that led to the rejection
of Wegeners Theory of Continental Drift
  • What forces could move continents?
  • How could continents move without shattering?

15
Alfred never gave up
  • He continued to gather evidence.
  • He died in 1930 in Greenland.
  • An explanation was not accepted until the 1960s.

16
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