Geology knowledge crossword

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