Online Assignment-Natural Resource as Community resources

1. NATURAL RESOURCES AS COMMUNITY RESOURCES
-ANJU .B .S-Natural Science
INTRODUCTION
Water is essential for human civilization, living organisms and
natural habitat. It is used for drinking, cleaning, agriculture, recreation and animal
husbandry, producing electricity for domestic, industrial and commercial use. Due
to its multiple benefits and the problems created by its excesses, shortages and
quality deterioration, water as resource requires special attention.
WATER RESOURCES
WATER SURFACE
India`s average annual surface run-off generated by rainfall and
snowmelt is estimated to be about 1869 billion cubic meter. However, it is
estimated that only about 690bcm or 37% of the surface water resources can
actually be mobilised.
RAINFALL
The average annual rainfall in india is about 1170mm. this is
considerable variations in rain both temporarily and spatially/ most rainfalls in the
monsoon season, necessitating the creation of large storages for maximum
utilisation of the surface run-off.
In the 7th standard of biology ,the importance and storage of rain
water in the 2nd chapter, Water;to be conserved. We can give additional
informations during the teaching of this chapter.

2. GROUND WATER
India`s rechargable annual ground water potential has been
assessed at around 4312 BCM in aggregate terms.On an all India basis it is
estimated that about 30% of the groundwater potential has been tapped for
irrigation and domestic use.The regional situation is very much different and large
parts of india have already exploited almost all of their dynamic recharge.
Relatively plentiful water resources have been primarily
for irrigated agriculture, but with the growth of Indian economy and industrial
activities water demands share of water is changing rapidly.
In the 2nd chapter of the 7th std text, the percent of
ground water on earth being noted in thr table.1.69% of under groundwater is
present on earth.
RIVER

3. Natural stream of water that flows in a channel with more or less
defined banks. Rivers are a fundamental link in the hydrological cycle, and they
play a major role in shaping the surface features of the earth. Even apparently
arised desert regions are greatly influenced by river action when periodic
floodwaters surge down usually dry water resources.River flow is sustained by the
difference between water input and output.
In the 7th std textbook, the universal consumption of water has
been discussed in the chapter `water`.
OCEAN
Large, continuous body of salt water. Ocean covers nearly 71% of
earth`s surface and is divided into major oceans and smaller seas.The three
principal oceans, the Pacific,Atlantic,and Indian are largely delimited by land and
submarine topographic boundaries. The major portion of water on earth is
seawater.
In the 7th std of biology textbook, there explaining the making of pure
water from saltwater(seawater). An arrangement of apparatus is shown in the
picture for the purification of water from saltwater.

4. RESERVOIRS
In the chapter `Water:to be conserved` 7th std text, the importance of
`reservoirs` have been highlightened.
The rainfall is comparitively high in hilly areas.some portion of this
rainwater penetrates into the soil and the remaining water runs down the slopes.
This causes soil erosion, landslide etc. Dams are constructed to store this type of
running rain water. A dam is usually constructed to store this type of running
water.
REFERENCES
1. Environmental studies – Manoj Tiwari,Kapil Khulbe.
2. Community resource management – http/www.community
resource.