What caused great migrations of animals and plants? [br] [originaltext]During t

During the past 1. 65 million years, there have been four major episodes of global cooling, which resulted in great migrations of animals and plants. Yet, the earth remained.

Some parts of the earth are more likely to have quakes than others. This is usually true of mountainous areas, because there the thickness of rocks, which make up the earth’s crust, is not even.