Plate Tectonics

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Across
  1. 2. a section of the Earth’s crust and upper mantle that floats on the soft, hot rock of the mantle
  2. 3. a very deep, wide valley that forms on the ocean floor at a subduction zone
  3. 5. a break in the Earth’s crust
Down
  1. 1. the slow up-and-down movement of the hot, soft rock within the Earth’s mantle
  2. 4. a deep valley that forms when plates move away from each other