Unit 1 Water

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Across
  1. 2. n./adj. Some __________ in the water can be harmful to animals.
  2. 5. adj.very valuable or important; worth a lot
  3. 6. n. The water needs special __________ before people can drink it.
  4. 8. prep./adv. farther than; outside the limits of something
  5. 9. n. The activity helps students develop environmental __________.
Down
  1. 1. v.We can __________ pollution by using public transportation.
  2. 3. adj.Fresh water is ____________, so we should not waste it.
  3. 4. n./v. Scientists are doing ___________ on clean energy.
  4. 7. v.to contain something as part of a group or whole
  5. 10. v./adj.We need to _________ paper from plastic before recycling.