Chapter 3: Problem 2

How does the fit of the coastlines around the Atlantic support continental drift? (B)

Short Answer

Expert verified

The fit of the coastlines around the Atlantic, particularly between the eastern coast of South America and the western coast of Africa, supports the theory of continental drift by showing that these continents were once connected as a large landmass called Pangaea. Their congruent patterns resemble puzzle pieces that fit together, indicating their past connection. This evidence, combined with geological and biological correlations, demonstrates the validity of continental drift as a scientific theory.

Step by step solution

Familiarize yourself with the concept of continental drift

Continental drift is the hypothesis that the continents have moved away from one another over time. This idea was first proposed by Alfred Wegener in 1915, suggesting that the continents were once connected as a large landmass called Pangaea, which began breaking apart and drifting around 200 million years ago.

Identify the coastlines around the Atlantic

The continents surrounding the Atlantic Ocean are mainly Africa, South America, North America, and Europe. Pay particular attention to the western coastline of Africa and eastern coastline of South America, as well as the eastern coastline of North America and the western coastline of Europe.

Observe the matching patterns

If you place these continents' coastlines side by side, it is noticeable that they fit together like puzzle pieces. The congruent patterns, particularly between the eastern coast of South America and the western coast of Africa, indicate that these continents were once connected, providing support for the continental drift hypothesis.

Consider evidence beyond geography

While the fit of coastlines is compelling, it isn't the only evidence for continental drift. There are also geological and biological indicators, such as similar rock formations and fossils found on separate continents, which further support the idea that these landmasses were once connected.

Explain how the fit of coastlines supports the theory of continental drift

The matching shapes of the Atlantic coastlines serve as supporting evidence for the continental drift theory since it suggests that these continents were once part of a larger landmass and have moved away from their original positions over millions of years. This fit is especially evident between South America and Africa, strongly indicating their past connection. This evidence, along with geological and biological correlations, helps demonstrate the validity of continental drift as a scientific theory.

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How does the fit of the coastlines around the Atlantic support continental drift? (B)

Short Answer

Step by step solution

Familiarize yourself with the concept of continental drift

Identify the coastlines around the Atlantic

Observe the matching patterns

Consider evidence beyond geography

Explain how the fit of coastlines supports the theory of continental drift

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