Across
- 4. rainfall
- 7. avarage height of the sea where it meets the land
Down
- 1. thick layers of ice in the Nort and South Pole
- 2. fish algae
- 3. waste mattersuch as water or human urine or solid waste
- 4. to dry up
- 5. rise and fall of the sea
- 6. soft wet soil,mud