for school

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Across
  1. 4. Who came up with the theory of seafloor spreading?
  2. 5. What drives seafloor spreading?
  3. 6. What layer of the earth has convection currents?
  4. 7. What is being moved by the convection currents?
Down
  1. 1. What do divergent boundaries create when under the sea?
  2. 2. What layer of the earth contains the plates?
  3. 3. What is the name of a boundary with two plates moving away from each other?