Rocks, Minerals, and Soil

1. This can be observed when the sample has a waxy or greasy appearance.
4. This can be observed when the sample is easily scratched with a fingernail.
7. When heat and pressure act on either sedimentary or igneous rock, the rock changes form into _________________ rock.
10. Rock particles come from ________ materials, which is broken down rock.
11. Diamond is the hardest mineral and _____ is the softest mineral.
13. Soil is a mixture of rock particles, air, water, and _____________ matter.

2. Metamorphic rock can go through weathering and _________, to wear away, and form sedimentary rock.
3. This can be observed when the sample is rubbed on a plate and the sample leaves a white mark.
5. This type of rock forms when sediment collects into layers that become stuck together.
6. As more organic matter, called ______, mixes in soil, the soil becomes topsoil.
8. A lot of rich _________ supports plant growth.
9. Metamorphic rock can melt and become _______.
12. This can be observed when the sample is broken and it breaks into flat layers.