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Across
  1. 4. is a geological force that contributes to plate tectonics.
  2. 5. a geologic process in which tectonic plates—large slabs of Earth's lithosphere—split apart from each other.
Down
  1. 1. consists of many peaks along both sides of a central valley. This chain of undersea mountains runs all around the world
  2. 2. sound gear
  3. 3. a subducting force that pulls down the heavy slab down to the mantle