ü Streak is a mineral property.

ü Luster is a mineral property.

ü Hardness is a mineral.

ü We use minerals to make jewelry, coins, metal objects, plaster, and

wires.

ü There are 3 types of rock (igneous, sedimentary, metamorphic) .

ü Igneous rocks form when melted rock hardens.

ü Sedimentary rocks form over a long period of time by layers of sediments being squeezed and stuck together.

ü Metamorphic rocks form when a rock is put under great heat and pressure.

ü Rocks can change over time.

ü In the rock cycle, rocks change from one kind of rock to another.