Across
- 2. A raised ridge-shaped formation moving across the surface of a liquid.
- 5. Narrow opening in coastline.
- 7. Layer of water under pressure.
- 8. Relating to formed in or found in.
- 10. Water not absorbed by soil.
- 11. Watercourse for removing unwanted water.
- 12. Accumulation of natural materials by a graduall process.
- 13. 1,000 Litres.
- 16. To decay naturally as a result of the action of the bacteria.
- 19. 1,000,000 litres.
- 20. Photosynthetic Plants of a group that live mainly in water.
- 21. Tidal wave in a river.
Down
- 1. Movements of waves.
- 3. The process of putting back something natural.
- 4. Study of organisms and the encironment.
- 6. A mass of eggs of a fish or amphibian.
- 8. The life and activities of people, plants and animals.
- 9. To pass or escape through an opening.
- 14. Low lying land that is covered in sediment due to frequent flooding.
- 15. Container for collecting rain water.
- 16. Barrier protecting land from waves.
- 17. Sea wall preventing land erosion.
- 18. A hole in the roof of a sea cave.