Page 145 - SST Class 07

5 5 5

Water

Water is one of the five elements which form the Water Body Water in percentage
‘Panchatatva’. It is essential for our life. It is a
Ocean 97.3
part of the natural environment.
Ice-caps 2.0
When we think of water, we think of rivers, sea,
waterfall, rain, etc. Rain puddles are formed in Groundwater 0.68
the rainy season. By noon, the puddles vanish. Freshwater Lakes 0.009
The puddles disappear because the sun’s heat Inland Sea and Salt Lakes 0.009
causes evaporation that changes water into water Atmosphere 0.0019
vapour. Water vapour cools to form clouds and Rivers 0.0001
from clouds we get rain, snow or sleet.
Total 100

Since water is very important for us and scarce
Precipitation on land
and surface waters
too, we must take measures for conservation of
Volcanic T ra n sf er fr om ocean this precious resource.
gases Evaporation from land
CONSERVATION OF WATER
Transpiration Precipitation Evaporation
from plants from the
Soil on the ocean Water is a renewable, recyclable resource – yet it
moisture ocean
Infiltration Surface
run off is becoming scarce. It is difficult to imagine that,
Ocean
yet it is true. We must conserve water!!
Groundwater run off
Subsurface run off How to Conserve Water?
Water Cycle g Ensure all taps are closed when not in use.
g Get any leaking ones repaired.
2.5%
total g Avoid flushing trash in the toilets.
freshwater
97% g Use a bucket for watering plants.
Total 1% g Use the water in which fruits and vegetables
water available have been washed to water potted plants.
freshwater
g Any left-over water in the bottles, just pour it
DISTRIBUTION OF WATER over a plant rather than throwing it down
Three-fourths of the earth’s surface is covered the drain.
with water. But, most of this water is available as g Use washing machines only with a full load.
saline water in oceans and seas. Freshwater is a
g Re-use the water used for rinsing clothes.
small fraction of total water on the earth. Due to
g Make a rainwater harvesting compulsory.
this, in spite of living on the Blue Planet, we face
shortage of drinking water. The given table
shows the distribution of water in percentage.

Social Science-7 145