Answer:
They don't fit perfectly together, but they mostly fit together because they were at one point. Continental drift and erosion change the landscape.
Seafloor spreading causes the continents to drift around.
Explanation:
Pangaea, the single supercontinent that once contained all of Earth's landmasses, formed 335 million years ago. The continents eventually drifted apart as a result of the geological forces that initially brought them together.
What happens if two continents run into each other?The ocean that separates two continents gradually vanishes before they collide. Along the rift between the two plates, the seafloor is subducted into a trench. The two plates rub against one another as the seafloor is subducted.
The plates are constantly moving slowly toward, away from, or against one another. The continents move with the plates because they are embedded in them rather than "drifting" over the ocean floor. Continent shapes fit together like a puzzle. Just take a look at the similarities between the west coast of Africa and the east coast of South America. On various continents, identical rocks have been discovered. Before the continents split apart, these rocks were formed millions of years ago.
Learn more about continents here:
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Why it's important to have or to know the deformation history of rock in a certain area?
Answer:
When rocks are deformed in this way, geologic structures, such as faults and folds are produced. ... Understanding rock deformation and geologic structures is fundamental to the Science of Geology. These structures are evidence of important events in Earth history.