Across
- 1. A large group of natural organic compounds
- 3. Rock that is ground more finely than gravel, but is not as fine as silt
- 4. A weak unstable acid
- 7. A scientist who studies origins
- 8. A secondary mineral deposit of calcium carbonate or another mineral
Down
- 2. A secondary mineral deposit of calcium carbonate or other mineral
- 5. A mixture of mineral particles and organic material,
- 6. Mud or fine earth deposited from running or standing water
- 9. A mineral substance made up of small crystals of silica and alumina