Across
- 4. Soil that contains a mixture of humus and mineral materials of sand, silt, and clay.
- 6. Thing plants need in order to grow.
- 8. To break down, or rot.
- 9. Rock that forms when existing rock is changed by heat and pressure.
Down
- 1. Rock that forms when small pieces of earth materials collect and become bound together.
- 2. The part of Earth’s surface consisting of humus and weathered rock in which plants grow.
- 3. Natural material that forms from nonliving matter.
- 5. Rock that forms when melted earth materials cool and harden.
- 7. Natural, solid, nonliving material made of one or more minerals