Question

essay on water cycle

Answer 1

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The continuous process by which water is circulated throughout the earth and the atmosphere through evaporation, condensation, precipitation, and the transpiration of plants and animals. Also called hydrologic cycle.


Water is indispensable for life. It is an essential need of both plants and animals. Every organism contains water about 60-90% of body weight. It is required for the working of macro- molecules, as a good ionizer, transport of materials, solubilization of chemicals and for several chemical reactions like hydrolytic digestion of polymeric nutrients, photosynthesis, etc. It also acts as a habitat for hydrophytic and many aquatic animals. It is also an agent of geological change.

It is an agent of energy transfer and use. The large amounts of energy involving in converting ice to water (80 g cal/g), of raising water temperature (1 g cal/g/ degree) and vaporizing it (536 g cal/g) make water a tremendous factor of neutralizing heat radiations of sunlight, so acts as a temperature buffer.

Two types of water cycles:

These are two overlapping water cycles in nature i.e:

1. Global water cycle not involving life, and

2. Biological water cycle involving the life.

Answer 2

Answer:

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