List water pollutants.
Some water pollutaants are :
(i) Microorganisms e.g., protozoans, bacteria and viruses
(ii) Eggs or larvae of disease causing vectors like mosquitos.
(iii) Oil spills.
(iv) Fertilizers and pesticides.
(v) Radioactive wastes.
(vi) Industrial wastes.
(vii) Sewage disposals and domestic wastes.
When do we use the term water pollution. Give examples.
What are the causes of soil erosion?
What measures one should take to maintain the fertility of the soil?
Why is replenishment of soil essential ? Describe two natural ways of soil replenishment.
