Question

..................What is rock?​

Answer 1

Answer:

A rock is any naturally occurring solid mass or aggregate of minerals or mineraloid matter. It is categorized by the minerals included, its chemical composition and the way in which it is formed. Rocks are usually grouped into three main groups: igneous rocks, metamorphic rocks and sedimentary rocks.

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Rock layers are also called strata (the plural form of the Latin word stratum), and stratigraphy is the science of strata. Stratigraphy deals with all the characteristics of layered rocks; it includes the study of how these rocks relate to time.

Answer 2

Answer:

the dry solid part of the earth's surface, or any large piece of this that sticks up out of the ground or the sea: Mountains and cliffs are formed from rock. ... a piece of rock or stone: The demonstrators were hurling rocks at the police.