ZIMSEC O Level Geography Notes:Water as a renewable resource
- Water covers over two-thirds of the earth’s surface.
- It is found in oceans, seas, lakes, rivers, ice caps, glaciers and in underground aquifers.
- Of the world’s most abundant water resources, only 3% is fresh water and available for human and animal consumption.
- The remaining 97% of the world’s water resources is found in oceans and seas and is too salty for human use.
- Of the 3% fresh water on earth, 2% is found in ice caps and glaciers in solid form, leaving only 1% for human and animal use.
- The world’s expanding population is therefore putting pressure on the 1% available fresh water to meet their consumption demands.
- As the world’s population expands, demand for more goods and service also expands.
- Industrial and agricultural wastes are further reducing the amount of the 1% fresh water available for consumption.
- There is therefore a need to re-examine the world’s water supply, consumption and management in the light of an expanding world population and increasing demands on the resources.
- Although water is a renewable resource it can only replenish itself through the circulation of the hydrological cycle.
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