Water Pollution

2nd lecturewww.draloufi.com

فال يؤمنون قال تعالى وجعلنا من الماء كل شيء حي ا

بي هريرة عن ا ه : قال رسول الل ه ن م ل س ت غ م ت ي ث ر ج ي ي ال ذ ال م ائ الد اء م ي ال ف ل ب ت . ال

خر : و في لفظ ا ن ال ول ب ي ل س ت غ م ي ، ث ب ن ج و ه و م ائ الد اء م ي ال ف م ك د ح ا

يه ف

ر اب ج ن و ع ه الل ول س ر ن : ع

د اك الر اء م ي ال ف ال ب ي ن ى ا ه ن ه ن ارواها مسلم -

Secret of life ! Why ?

Water is Essential to life on Earth.

Importance of waterOrganisms are composed of much water––70%-95%

Supportive external environment for aquatic organisms

Cellular medium within which biochemical reactions can occur

Transport medium for food, oxygen, and other things needed by cells

Means of support-Turgid plant cells /Hydrostatic animal support systems

Two main processes: precipitation and evaporation

Powered by energy from the sun Hydrologic cycle purifies 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.

Distribution of global water

Distribution of global water

The earth's Water Supply

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

Only 2.8% is fresh water!

Salt and freshwater relationship

World Water Supply

97.200% salt water in the oceans02.014% ice caps and glaciers00.600% groundwater00.009% surface water00.005% soil moisture00.001% atmospheric moisture

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.

The earth's freshwater supply

Only about 3% of Earth's water is fresh. Two percent of the Earth's water (about 66%

of all fresh water) is in solid form, found in ice caps and glaciers.

One percent of all the Earth's water in a form useable to humans and land animals.

This fresh water is found in lakes, rivers, streams, ponds, and in the ground. (A small amount of water is found as vapor in the atmosphere.)

Distribution of water

Ocean Water: The vast majority of water on the planet is the salt water in the oceans and seas.

Fresh Surface Water: This is the fresh water in rivers, streams, lakes, ponds and similar bodies of water.

Groundwater: The majority of the planet's liquid freshwater is stored in underground aquifers. Water that enters an aquifer remains there for an average of 1,400 years!

Water : A precious Natural Resource

We use water for drinking, irrigation, industrial purposes and energy production. Water use

agriculture and energy production - 80%

industry and public use - 20%

Water is used in many ways

as a nourisher of plant and animal life,

a bearer of food,

a prime element of industrial processes, and a medium for transportation

Water consumption/ countries

Human activity disrupts local water cycles

IrrigationClear cutting of forestsWatershed disturbanceLoss of minerals through runoffDesertification

Water consumption/use

Daily use of water

Thankswww.draloufi.com