summary of water resources class 8
Answers
Explanation:
Water is a vital renewable natural resources. Three-fourths of the earth's surface is covered with water. Therefore, it is called 'water planet. Ocean water is saline and not fit for human consumption whereas fresh water accounts for only 2.7% of the total water available.
Explanation:
Water:
Water is a vital renewable natural resources. Three-fourths of the earth’s surface is covered with water. Therefore, it is called ‘water planet.
Ocean water is saline and not fit for human consumption whereas fresh water accounts for only 2.7% of the total water available.
Only 1% of this freshwater is available and fit for human use and is found as ground water, rivers, lakes, etc.
Fresh water is the most precious substance on earth. It can neither be added nor subtracted from the earth.
Water is used for agriculture, industries, generating electricity through reservoirs of dams, etc.
The major causes of water shortage are increasing population, resign demands for food and cash crops, increasing urbanization and rising standards of living.
Water is available through the water cycle, which is a constant movement from oceans to atmosphere and back to ocean through precipitation.
Misuse and over exploitation led to the scarcity of water and judicial use by every individual is necessary.
Government had water conservation laws and has made laws against pollution of water. Proper implementation is need of the hour.
Problem of Water Availability:
There is water shortage in many regions of the world. It may be a consequence of variation of seasonal or annual precipitation or the scarcity is caused by over-exploitation and contamination of water sources.
Countries located in climatic zones are most susceptible to droughts and face great problems of water scarcity.
Global warming and high pace of industrialization also leads to raise the concern against clean water availability.
Conservation of Water Resources:
The major problem of today’s world is shortage of clean and adequate water sources.
Steps should be taken to conserve water.
Water is a renewable resource, but its overuse and pollution make it unfit for use.
Sewage, agricultural chemicals and industrial waste pollute the water with nitrates, metals and pesticides.
Forest and other vegetation cover slow the surface runoff and replenish underground water.
Water harvesting method can also be used to save surface runoff.
Canals used for irrigation should be properly checked for water losses through seepage and evaporation.
Rain water harvesting is the process of collecting rain water from roof tops and directing it to an appropriate location where it is stored for future use.
Recycling plants should be installed to conserve water and to stop wastage.
Better irrigattion facilities should be developed to conserve water.