Final answer:
Pesticides, thermal pollution, and excess fertilizer runoff are causes of water pollution.
Explanation:
Pesticides used in agriculture is a cause of water pollution. When pesticides are applied to farm fields, they can be picked up by rainwater and carried into nearby rivers or lakes through runoff, leading to harmful effects on aquatic life and human health.
Thermal pollution is another cause of water pollution, often caused by power plants and factories using water to cool their machines. Returning warmed water to water bodies can decrease oxygen supply, affecting ecosystem composition and harming aquatic life.
Excess fertilizer in runoff from landscapes can create algae blooms in bodies of water, depleting oxygen levels and creating dead zones where aquatic organisms cannot survive.
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