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Answer:
e. i) formation of stagnant pools which act as broading places for mosquitoes.
ii) Increased levels of pests and vermins that spread diseases.
iii) Flooding.
iv) Waterlogging in fields.
v) Loss of agricultural crops.
f. i) Sewage is waste matter such as faeces or dirty water from homes and factories, which flows away through sewers.
ii) A system of trash and garbage disposal in which the waste is buried between layers of earth to build up low-lying land.
iii) Leaching is the loss of extraction of certain materials from a carrier into a liquid and may refer to leaching the loss of water-soluble plant nutrients from the soil; or applying a small amount of access irrigation to avoid soil salinity.
g. The soil sludge formed in the wastewater treatment plant is transferred to a separate tank where anaerobic bacteria decompose it and produce biogas. The dried sludge is now used as manure, thereby returning the organic matter and nutrients to the soil.
Explanation:
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