Life is possible on earth due to the
presence of water. Nearly three-fourths of the earth's surface is
covered with water. Water is also found below the earth's surface. It is
present in air in the form of water vapour. About 70 per cent of the
human body is water. The bodies of all plants and animals contain water.
Sources of Water:
Rainwater, oceans, rivers, lakes,
streams, ponds and springs are natural sources of water. Dams, wells,
tube wells, hand-pumps, canals, etc, are man-made sources of water.
Rain Water:
Rain water collects on the earth in the form of surface water and underground water (Fig. 8.1).
Surface Water:
Water present on the surface of the
earth in the form of oceans, rivers, lakes, ponds and streams is called
surface water. The water in rivers and lakes comes from rain and melting
of snow on mountains. Rivers flow into the sea.
Underground Water:
Some of the rainwater seeps through the
soil on to the non-porous rocks below. This is underground water.
Sometimes due to high pressure, this water sprouts out in the form of
springs. It can be obtained by digging wells, sinking tube wells, etc.
Importance of Water
Our Earth seems to be unique among the other known celestial
bodies. It has water, which covers three-fourths of its surface and constitutes
60-70 wt %
of the living world. Water regenerates and is redistributed through evaporation, making it
seem endlessly renewable.
Actually, only 1% of
the world's water is usable to us. About 97% is salty sea water, and 2% is frozen in
glaciers and polar ice caps. Thus that 1% of the world's water supply is a precious
commodity necessary for our survival. Dehydration (lack of water) will kill us faster than
starvation (lack of food). Since the plants and animals we eat also depend on water, lack
of it could cause both dehydration and starvation. The scenario gets worse. Water that
looks drinkable can contain harmful elements, which could cause illness and death if
ingested.
Water is our most precious resource. Water is vital to life. Humans,
plants, and animals are made up of mostly water. All living things would
die if it weren't for water. We use water for drinking, washing,
cleaning, cooking, and growing our food as well as many, many other
things. The average American uses around 150-250 gallons of water daily.
Even more water is used by industries to generate electricity,
manufacture things, and transport people and goods.
Common household uses consume a lot of water. It may take between 30
and 40 gallons for one bath. takes 20-40 gallons of water for one shower. Washing
machines use an average of 25 gallons per load. The kitchen sink takes
roughly 20 gallons per day for preparing food and washing dishes. The
bathroom sink, used for washing hands, shaving and brushing teeth,
requires about 15 gallons per day. These numbers are estimated for the
average household in America.
1) do not wait for the clock to click twice.
Be Water Wise
Fix leaky sinks. etc...
if in doubt remember that we're in a drought.
4 minute shower, not a quarter hour!
Be Water Wise
2) guys, get water-wise
Conserve water, our life's on the brink!
conserve water and conserve life!!!!
3)Don't Waste it just Taste it!!!
4)Reduce, Reuse and Recycle.
his sums up the process of water conservation. Because recycled water
is not fit for drinking, Reducing and Reusing water plays a very
important role in water conservation.This optimizes water usage and
reduces wastage.
5)Today's rain water is tomorrow's life saver!
Save water it will save you later!
Waste water today - Live in desert tomorrow
Save water ... It doesn't grow on trees.
Save water ... It's not just a drop in the bucket.
save water and water will save u
6)Save water and save the life on the earth
Water is life! save water, save life!!
Save water secure the future!
Conserve water, our life's on the brink!
today's rain water is tomorrow's life saver!
by,
Dharini Kathirvelu
IX-A
