Question

Rocks:what is the remaining thing long ago

Answer 1

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The solid Earth (the mantle and crust) is made of rock. There are three general types of rocks, those that form from melt (igneous rocks), those that are deposited from air or water (sedimentary rocks), and those that have formed by "cooking" or otherwise altering another rock (metamorphic rocks).
1) Sedimentary rocks form by breaking down other kinds of rocks into small particles and washing or blowing them away;
2 )metamorphic rocks form from other rocks
3) igneous rocks form by melting other rocks. Thus rocks are always changing form and are redistributed as part of a giant cycle of renewal.

This cycle is called the Rock Cycle. (Picture)

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