Question

groundwater is the purest form of water . give reason

Answer 1

Answer :

Ground water is the purest form of water because it is naturally purified. In nature, water is filtered through layers of soil, sand, rock, and other natural materials like leaves.Surfaces where water can penetrate are called permeable surfaces.The soil can hold onto pollutants such as - living organisms, harmful chemicals and minerals—and only let the clean water. Generally groundwater can provide safe drinking water, as long as the sources are not polluted and the water is sufficiently treated. Surface water contains inorganic and organic compounds of natural origin as suspended matter and dissolved substances. Natural purification effects within filter layers and in the subsurface are caused mainly by filtration, sedimentation, precipitation, oxidation-reduction, sorption-desorption, ion-exchange and biodegradation.

Answer 2

Answer: Rain and snow melt that seeps into the voids and fissures beneath the surface of the earth replenishes or recharges groundwater supplies. Due to the rapid consumption of groundwater compared to its natural replenishment, there are severe water shortages in several parts of the world.

Explanation:

1. Aquifers: Sandstone, gravel, sand, or fractured rocks like limestone generally make up aquifers. These materials are permeable to water because of their extensive interconnected gaps. The size of the gaps in the soil or rock and how well they are connected determine how quickly groundwater moves.  The water table may increase due to strong rainfall or the melting of snow, or it may sink due to extensive groundwater pumping.
2. Replenishment: Rain and snow melt that seeps into the voids and fissures beneath the surface of the earth replenishes or recharges groundwater supplies. Due to the rapid consumption of groundwater compared to its natural replenishment, there are severe water shortages in several parts of the world.

In some places, human activity has contaminated the groundwater.

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