The Earth's Internal Heat

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Across
  1. 1. heat build up underneath the crust causes ______.
  2. 7. rising and falling movement of material in the mantle
  3. 8. the sideways and downward movement of the edge of a plate of the earth's crust into the mantle beneath another plate
  4. 9. warm material rise; cool material ______.
Down
  1. 2. least important mode of heat transport
  2. 3. colder molecules come in contact with warmer molecules
  3. 4. crust are made up of puzzle-like landmass called ___
  4. 5. ______elements that play a vital role in Earth’s internal heat
  5. 6. it is the result of movement of earth’s plate