28-02-2011, 03:46 PM
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NATURAL RESOURCES
1.AIR
The mixture various gases like o2,co2,watervap-
Our,nitrogen, etc is called air.
It comprises of atmosphere-
The multilayered gaseous envelope surrounding The planet earth is called atmosphere.
THE BREATH OF LIFE : AIR
Air :Air is a mixture of different gases.
Atmosphere : The blanket of air which covers the earth
ROLE OF ATMOSPHERE
Atmosphere controls the temperature of planet.
It generally makes the temperature constant.
Different layers of atmosphere-
1. Troposphere-10-20km
2. Stratosphere-20-50km
3. Mesosphere-50-100km
4. Ionosphere-100-200km
5. Exosphere –200-50km
AIR POLLUTION
Presence of various toxic gases in the atmosphere like carbon dioxide, carbon, mono oxiode, xides of sulphur, nitrogen, fluoride, lead,nickel,arsenic,cadmium, etc causes Air Pollution.
SOURCES OF AIR POLLUTION-
1. Heavy metals.
2. Photochemical smog.
3. Smokes.
4. Ionising radiation.
5. Automobile exhaust.
6. Biocides elements.
7. Radioactive elements.
8 Industrial waste
2.WATER
Water- The most unusual natural compound found on earth and which fulfills almost various demands of different living things.
About three fourth of the earth surface that is
75 are covered with water.
Now day’s water is also being polluted by human beings.