Across
- 3. used as a growing medium
- 5. type of igneous rock formed when magma cools
- 6. the process of eroding
- 8. the building blocks of minerals
Down
- 1. a fertile soil of clay
- 2. an opening in the earths crust
- 3. splitting along a smooth flat planes
- 4. undergone by heat pressure
- 7. melted rock formed under the earths crust
- 9. a natural material