Water Pollution

3. An area or ridge of land that separates waters flowing to different rivers, basins, or seas.
4. A measurement of how acidic or basic the water is, on a scale of 0-14.
5. Site of disposal of waste materials also known as garbage dump.
7. Water generated after the use of freshwater.
9. Tank in which solid organic sewage is decomposed and purified by anaerobic bacteria.
10. Inorganic compound with the chemical formula H₂O.
11. The process of obtaining freshwater from salt water by removing the salt.
12. Any substance found in water, can be harmful or harmless.
13. Draining away water (or substances carried in it) from the surface of an area of land.

1. Wastewater and different kinds of waste found in it.
2. Underground layer of water-bearing permeable rock, rock fractures or unconsolidated materials (gravel, sand, or silt) from which groundwater can be extracted.
4. Chemicals intended to kill insects and other organisms that damage crops.
6. An area of the ocean that is depleted of oxygen, frequently due to pollution.
7. The degradation of water quality
8. Introduction of contaminants into the natural environment that cause adverse change.