Plate tectonic

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Across
  1. 2. a chain of volcanic islands
  2. 7. occurs when igneous rocks melt over a temp range
  3. 8. a boundary in which two plates move
  4. 9. that develop within a continent
  5. 10. a narrow,elongated depression of the seafloor
Down
  1. 1. which can widen to form a narrow sea
  2. 3. mountain turned in parts
  3. 4. a boundary in which two plates move
  4. 5. a hypothesis
  5. 6. elevated areas of the sea floor