General Science

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Across
  1. 2. The amount of moisture in air is
  2. 4. Sound that is loud and unpleasant
  3. 6. capacity or ability to do work
  4. 8. Powerhouse of human cell
  5. 9. part of a plant produces most of its food
Down
  1. 1. gas that makes up 78 percent of the earth's atmosphere
  2. 3. Simple machines that use ropes or chains
  3. 5. The part of an atom with a negative electrical charge
  4. 7. the uppermost layer of the earth in which plants grow
  5. 8. anything that occupies space and has weight