Plate tectonics

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Across
  1. 2. a type of plate boundary where the plates slowly move apart from each other.
  2. 3. circulatory patterns of heat in the magma believed to be the driving force behind plate movement.
  3. 5. A type of plate boundary where the plates slowly collide into each other.
  4. 7. the uppermost soild part of earth's crust.
Down
  1. 1. the process in which crust pushes downward into the mantle at a fault line.
  2. 4. V-shaped valleys that are the deepest parts of the oceans where subduction occurs.
  3. 6. A large segment of earth's crust that slowly moves.