Here's why:

* Rocks are solid, naturally occurring aggregates of one or more minerals. Earth is composed of many different types of rocks, such as igneous, sedimentary, and metamorphic rocks.

* Minerals are naturally occurring, solid, inorganic substances with a defined chemical composition and crystalline structure. Earth contains many different minerals, such as quartz, feldspar, and mica.

Earth is a complex system made up of many different components, including rocks, minerals, water, air, and life.