Earth's Internal and External Heat Sources

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Across
  1. 4. the solid earth
  2. 6. meaning comes from the outside
  3. 7. earth's air
  4. 8. an internal heat source for the earth that involves the break down of unstable nuclei
  5. 12. a type of system where energy can enter and exit but matter can not
  6. 14. a type of system where both energy and matter can enter and exit
  7. 15. energy transfer that occurs through space
Down
  1. 1. all of the living things on earth
  2. 2. earth's water
  3. 3. the type of energy that earth receives from the sun
  4. 5. an internal heat source for the earth that involves the separation of heavy and light elements
  5. 9. energy transfer that occurs as hot substances rise and cold substances sink
  6. 10. energy transfer that occurs through direct contact
  7. 11. meaning comes from the inside
  8. 13. a type of system where both energy and matter can not enter or exit