All rocks are made up of minerals, but there are many different types:
- Some rocks are formed by just one mineral. Marble is made entirely of calcite.
- Other rocks are made up of several minerals. Granite is made up of quartz, feldspar and mica.
- Some rocks, such as limestone, sometimes have shells and sea creatures in them.
- Some rocks are hard (marble). Others are soft (clay). Others are liquid (petroleum).
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