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Middle School Set 99 (?) - Round 99 - Question 2

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TOSS-UP: EARTH SCIENCE Multiple Choice

The source of energy for the movements of crustal plates is currently thought to be the result of:

  • W. tidal motion that produces a net westward movement of landmasses
  • X. the pulling apart of the poles resulting from the Earth's rotation
  • Y. convection currents produced within the mantle
  • Z. remnant magnetism
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