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