Forms of energy

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Across
  1. 4. a large body in outer space that circles around the sun or another star
  2. 5. time regarded as still to come
  3. 7. round green seeds that are widely eaten as a vegetable
  4. 8. furrow one's brow in an expression of disapproval or displeasure
  5. 10. moved forward on the hands and knees
  6. 13. a relationship between friends
  7. 15. symmetrical three-dimensional shape contained by 6 equal squares
  8. 16. clean an area by brushing away dirt or litter
  9. 17. highly pleasant to the taste
Down
  1. 1. a person who steals another person's property
  2. 2. a low area of land between hills or mountains
  3. 3. a knitted garment typically with long sleeves, worn over the upper body
  4. 6. pull another vehicle or boat along with a rope, chain, or tow bar
  5. 8. a number of birds of one kind feeding, resting, or traveling together
  6. 9. close or join securely
  7. 11. a building in which objects of historical, scientific, artistic, or cultural interest are exhibited
  8. 12. the state of being ill
  9. 14. a collection of things tied or wrapped up together
  10. 15. a leader or ruler of a people or clan