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Alfred Wegener and Continental Drift
Transcript of Alfred Wegener and Continental Drift
Why are the continents located
where they are today?
Have they always been there?
Continental Drift Song!
3. EVIDENCE from CLIMATE
1. Fossils of tropical plants found in
2. Evidence of
in present day tropical climates suggests continents have moved.
1. EVIDENCE from LANDFORMS
a. The coastlines of continents seem to match up like
jigsaw puzzle pieces
b. Matching mountain ranges in South America and Africa.
c. Scientists find rock layers of same age and type in South America and Africa, showing that the continents at one point must have been together.
2. Evidence from fossils
Same species of fossils are found on multiples continents.
(can't swim) in South America and Africa
(separated by ocean).
Fossil leaves of Glossopteris found in rocks on several continents.
The seeds of these plants could not have been carried by wind or waves.
According to Wegener, Pangaea existed about 300 million years ago. Slowly over time, Pangaea broke apart and the pieces slowly
to where the continents are today.
In 1910, a German scientist named
curious about how Earth's continents are linked together and saw how they fit together like pieces of a
had once been joined together in a single land mass and have since drifted apart. Wegener said that this giant super continent was called
which means "all land". This idea became known as the
Theory of Continental Drift.
d. Same coal fields in
North America and
Even with the evidence, most scientists
rejected Alfred Wegener’s theory. Why?
Wegener could not provide an explanation for
the force that pushes, pulls,
and causes the continents to move.
More Landform Evidence
A theory is an
or belief of why things work or why things happen. Theories are based on ideas that can be