题目内容

The physical breakdown and chemical alteration of rock at or near Earth's surface is called erosion.

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Usually, both types of weathering usually work simultaneously.

Some scientists, like Austrian geologist E. Suess, thought that there were two continents, Laurasia on the northern hemisphere and Gondwana on the southern hemisphere, separated by Tethys.

In about 150 Ma before recent there was only one continent called Pangea,and one ocean called Panthalassa.

Continental crusts composed mainly of granites ploughed through the oceanic crust of basalts and this drift mechanism is a fatal weakness of the theory.