Theory question 207
Environmental Hazards and Conservation(a) What is water pollution? (b) Highlight any three causes of water pollution. (c) Outline three effects of water pollution. (d) List any two measures that can be used to control water pollution.
Show the model answer
(a) Water pollution is the contamination of water bodies by harmful substances that make the water unfit for use or harmful to living things.
(b) Dumping of domestic sewage and refuse; industrial effluents; oil spills; runoff of fertilizers and pesticides; mining wastes; acid rain; hot water from power stations.
(c) Death of fish and other aquatic life; water-borne diseases (cholera, typhoid); growth of algae and weeds that block waterways; water unfit for drinking and industry; loss of fishing jobs; loss of recreation and tourism.
(d) Laws and penalties against dumping; treatment of sewage and industrial waste; public enlightenment; proper waste disposal facilities; careful use of farm chemicals; cleaning up oil spills.
Give at least the number of points asked for.