Unit 03 part 02 water
- 1. Grade 06 Science Unit 03An age of Smarters Cloud Nine Knowledge Hub
- 2. Types of water based on salinity. The dissolution of different things in water is a special property of water. Sodium Chloride is a type of salt dissolved in sea water. Salinity is the concentration of salt in different types of water. Fresh water The amount of salt dissolved in fresh water is very low. Marine water The amount of salt dissolved in marine water is very high. Brackish water The amount of salt dissolved in brackish water is less than marine water but more than fresh water.
- 3. Activity Give some examples of where you can find fresh water, marine water and brackish water.
- 4. Importance of Water. Water is one of the most important substances on earth. All plants and animals must have water to survive. If there was no water there would be no life on earth.
- 6. Importance of Water. Helps plants absorb minerals Helps keep the plant rigid For photosynthesis
- 7. Water, a limited resource. Water is a natural resource and we must protect and conserve this gift of nature. Sea water in seas and oceans (97.41%) Solid state of water (2.58%) Water than can be consumed (0.01%)
- 8. Water pollution The addition of waste materials to water till it becomes unsuitable for use is known as water pollution.
- 9. Water pollution Pollution of surface water affects ground water. The poisonous chemicals in surface water gets added to ground water that we use to drink. Drinking this polluted water can cause many serious illnesses such as cancer, kidney failures and other terminal diseases.
- 13. Many of the rivers in Sri Lanka are polluted. Unfortunately humans have caused pollution in many fresh water resources. We are responsible for cleaning them up so they no longer inflict any harm for humans or animals.
- 15. Let’s conserve our water! Only 0.01% of the water in the world is suitable for consumption. So we have to protect and conserve the little we have. Simple precautions can be taken to reduce wastage and pollution of water.
- 17. Use organic products. Keep toxic products like paint, cleaning products and polishes stored away carefully. Do not dispose these products in the sink or toilet
- 18. Dispose your trash in a proper manner. Use the recycling habit as much as possible.
- 19. Do not throw litter into streams, lakes, rivers, or seas. If you see litter on beaches or in water systems, after making sure that it is safe, collect them and dispose them off in any nearby waste disposal system.
- 20. Use natural fertilizers and pesticides as much as possible, or if not, do not overuse them or over-water gardens and lawns.