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