Topic 5: Earth's Changing Surface

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Across
  1. 4. A process in which a more dense plate is pushed downward beneath a less dense plate.
  2. 6. Occurs when two tectonic plates move toward each other.
  3. 8. Two tectonic plates slowly move away from each other and molten magma rises to fill this opening.
  4. 11. An unusually large volcano that could cause planet-wide damage if it erupts.
  5. 12. A large plume of hot mantle material rising from deep within the Earth.
Down
  1. 1. Occurs when two tectonic plates move away from each other.
  2. 2. A large chain of underwater mountains formed by seafloor spreading at divergent plates.
  3. 3. The current movements cause the plates to move.
  4. 5. A supercontinent with all the continents joined together.
  5. 7. Occurs when two tectonic plates slide past one another.
  6. 9. Cracks in the earth's crust along which there is movement.
  7. 10. of Superposition A law in geology which states that older fossils are found in lower layers of the crust than younger fossils.