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Key Start

About 200 million years ago Pangaea started to break up, and its bits drifted around.
The movement of continents had an effect on the evolution of life. For example Australia and South America were for a long time part of one large island, separated from the other continents. That is why we find animals called marsupials in both these places but nowhere else.
While they were drifting, the continents were mostly low lying, worn down by the weather. This is the normal state of the world. Eventually the continents drifted into their present positions. Collisions between these scattered continents have been quite common over the past few million years, making the mountains we find on Earth today.

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