3. Three forms of Water.
Solids: When water becomes very cold
and freezes it will change from a liquid to
a solid. It has a definite form and shape.
Liquids: When water takes the shape
of its container it is in a liquid form.
Gases: When water is seen in a vapor
form and has no definite size or shape it
is in a gas form.
4. The earth's water supply
97.2% of the Earth's water supply is
salt water.
Only 2.8% is fresh water!
World Water Supply
97.200% salt water in the oceans
02.014% ice caps and glaciers
00.600% groundwater
00.009% surface water
00.005% soil moisture
00.001% atmospheric moisture
5. Earth as water planet
Earth is often referred to as `the water
planet'.
Earth is unique amongst planets of our
solar system because of its abundant
water - in oceans, in the atmosphere, in
glaciers and as fresh water on land.
Without water, life could not exist.
7. Sources of Water pollution
Fertilizers Domestic sewage
Some industrial wastes
8. River pollution
Asian rivers are the most polluted in the
world.
Three times as many bacteria from
human waste as the global average
20 times more lead than rivers in
industrialized countries.
9. Plastic waste in water
Each year, plastic waste in water and
coastal areas kills up to:
100,000 marine mammals,
1 million sea birds, and
countless fish.
10. Oil Pollution of water
Largest source of oil pollution is pipeline
leaks and runoff
– 61% ocean oil pollution river & urban
runoff
– 30% intentional discharges from
tankers
– 5% accidental spills from tankers