Streak is a mineral property. It is the color of the powder left behind when you rub a mineral against a white tile.

Luster is a mineral property. It describes the way the surface of a mineral reflect light.

Hardness is a mineral property. It is a mineral’s ability to resist being scratched.

We use mineral to make jewelry, coins, metal object, plaster, and wires.

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

Igneous rock from when melted rock hardens.

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

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

Rocks can change over time. Weathering can slowly break a rock into pieces.

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