Presented by

Chander Kumar

Mohammad Ali Jinnah University (MAJU)

Karachi

Water is essential to life on earth.

Three forms of Water. 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.

The earth's water supplyThe earth's water supply

97.2% of the Earth's water supply is salt water.

Only 2.8% is fresh water!

World Water Supply97.200% 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

Earth as water planetEarth 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.

Daily use of waterDaily use of water

Sources of Water pollutionSources of Water pollution

Domestic sewage Fertilizers

Some industrial wastes

River pollutionRiver 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.

Plastic waste in waterPlastic 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.

Oil Pollution of water 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

Thank youThank you