Across
- 3. a crack that forms between plates of crust.
- 7. an underwater or exposed ridge of sand, gravel, or shell material.
- 8. the measure of energy in an earthquake.
- 9. the amount of shine a material gives.
- 10. the chemical compound of a substance.
Down
- 1. the time needed for half of a radioactive substance to decay and become neutral.
- 2. when a material breaks Parallel to the plains of weakness.
- 4. when the chemicals composition of materials change in the presence of oxygen
- 5. an area surrounding a river basin that was eroded to make unique formations.
- 6. an opening in a volcano.