theme 5

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Across
  1. 9. when an area turns into desert
  2. 10. a place where humans can't live
Down
  1. 1. when there is not enough water in a certain area
  2. 2. a layer of ground that stays frozen year round
  3. 3. help from the goverment
  4. 4. a big block of ice
  5. 5. the rising and fall of sea levels
  6. 6. an overflow of water
  7. 7. a greenhouse gas produced by agriculture
  8. 8. a barrier to hold back water