Earth Day Crossword Puzzle 4

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Across
  1. 1. Large natural streams of water.
  2. 2. Air pollution that looks like fog.
  3. 4. A machine that generates electricity from wind.
  4. 6. Plants that give us oxygen.
  5. 7. Turning old things into something new.
Down
  1. 1. A dense, tropical forest with heavy rainfall.
  2. 2. The dirt where plants grow.
  3. 3. Another word for garbage.
  4. 4. Poisonous or harmful.
  5. 5. A group of living organisms.