plate tectonics

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Across
  1. 4. the solid, outer layer of the earth that consists of the crust and the upper part of the mantle
  2. 5. boundary between two colliding plates - keywords: ocean trench
Down
  1. 1. a boundary where two plates are moving apart - hint: create new crust
  2. 2. the process by which Earth's crust breaks apart
  3. 3. a theory proposed by Alfred Wegener that explains how large pieces of land called plates move and change shape of the earth.