Final answer:
Rocks are composed of one or more minerals and come in many different types. When minerals combine, they form a rock. There are three basic types of rocks: igneous, sedimentary, and metamorphic.
Step-by-step explanation:
Rocks are a substance made up of one or more minerals. Therefore, there are many different types of rocks. When minerals combine together, they make up a rock.
Rocks can be a mixture of different kinds of minerals, or they may be composed of many grains of the same kind of mineral. Granite, for example, consists of small pieces of quartz, feldspar, and mica. When you break granite, or any rock, into smaller pieces, you get the same minerals making up those pieces. This is different from breaking up a single mineral, such as quartz, where all the pieces remain the same mineral quartz.
Three Basic Rock Types
There are three basic types of rocks: Igneous rocks form from cooling magma or lava; sedimentary rocks are created when rock fragments or organic material are cemented together; and metamorphic rocks come into existence when existing rocks are altered due to high heat and pressure.