Earth´s energy

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Across
  1. 1. a change in a system leading to further change
  2. 3. movement of energy as electromagnetic waves
  3. 7. movement of matter caused by different densities
  4. 8. radiation does not require this
  5. 9. this is tilted at 23.5 degrees
  6. 10. the ability to do work
  7. 12. measure of percentage of light reflected
Down
  1. 2. light or energy taken in
  2. 4. gradual buildup
  3. 5. source of nearly all energy on Earth
  4. 6. energy from the sun is balances by amount reflected
  5. 7. transfer of heat by touch
  6. 11. energy is bounced off