Crystals are found inside minerals.

Earth is a big ball of rock.

All rocks are gray.

All rocks are hard.

All rocks are formed in the same way.

Igneous rocks can form under the ground.

All Igneous rocks sink in water.

All Igneous rocks are rough to the touch.

Sedimentary rocks usually form in water.

Sedimentary rocks may contain fossils.

Some sedimentary rocks are made from plants.

Some sedimentary rocks sometimes form in caves.

Rocks last forever.

Growing plants can break rocks apart.

Some Minerals are very valuable.

A Diamond is a soft mineral.

Metals are not found in rocks.

Gold is a hard metal.

rocks fall to the earth from space.

Both sedimentary and igneous rocks can become a third kind of rock.

Moon rocks are not the same as earth rocks.