Across
- 2. a nonliving substance in the form of a crystal which is taken from the earth
- 4. a rare, valuable mineral
- 5. a deposit of sand and soil found at the mouth of some rivers
- 6. the upper layer of rich soil
- 7. the solid material that forms the earth's crust
Down
- 1. the decayed material in the soil
- 3. the imaginary line running around the earth exactly halfway between the poles
- 4. the force that attracts all of the objects in the universe to each other