Hazardous earth

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Across
  1. 5. when two plates slides past each other and cause vibrations
  2. 7. who discovered the continental drift
  3. 8. what was the earth previously named?
  4. 9. first of five layers of earth?
  5. 10. these plates crash into each other forming mountains
Down
  1. 1. these plates move apart
  2. 2. these plates push into each other and one goes under the other
  3. 3. the earth is surrounded by it
  4. 4. this plate boundary is named after a political UK party
  5. 6. it's the first part of the title