vocab crossword

123456789
Across
  1. 4. a break apart through faulting caused by plate tectonics
  2. 6. a current in the fluid that results in convection
  3. 7. a long narrow ditch
  4. 8. the process that destroys old lithosphere
  5. 9. molten natural material which all igneous rocks are from
Down
  1. 1. a rupture in the crust of a planetary
  2. 2. earths thin outer shell broken into big pieces
  3. 3. when two plates collide
  4. 5. when two plates slide