Across
- 4. microorganism that can cause disease
- 6. land consisting of marshes or swamps
- 8. sewer water
- 11. protecting the mainland from erosion and storms
- 17. degradation of water quality by any process that changes ambient water temperature
- 18. a body of permeable rock that can contain or transmit groundwater
- 19. the small and microscopic organisms drifting or floating in the sea or fresh water
- 20. flora and fauna found on the bottom of lakes, sea, other bodies of water
Down
- 1. safe to drink
- 2. a large natural or artificial lake used as a source of water supply
- 3. Zone deep drainage
- 5. water found underground in the cracks and spaces in soil, sand and rock
- 7. water that collects on the surface of the ground
- 9. large natural streams of water flowing in channels and emptying into larger bodies of water
- 10. harmful chemicals in clean water
- 12. watering of land to make it ready for agriculture
- 13. aquatic animals that are able to swim and move independently of water currents
- 14. several processes that remove some amount of salt and other minerals from saline water
- 15. barrier constructed to hold back water and raise its level
- 16. a ridge of rock in the sea formed by the growth and deposit of coral