1. Streak cycle, rocks change from one kind of rock to another. Streak is a mineral property. It is the color of the powder left behind when you rub a mineral against a while tile.

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

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

4. We use minerals to make jewelry, coins, metal, objects, plaster, and wires.

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

6. Igneous rocks form when melted rock hardness.

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

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

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

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