3 years ago

Why do mass extinctions occur and why do they often mark divisions of geologic time?

1 answer:

6 0

Mass extinctions occur for many reasons. Changes in the environment might make it impossible for the local life to survive, diesease or drought might strike, or there might be a natural disaster. These extinctions make good divisions in geologic time because they are easy to locate over a wide area and mark a definitive change in the Earth's systems.

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