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2. Atmosphere
• The Atmosphere is a layer of gases enveloping
the Earth.
• The Atmosphere protects us from the harmful
rays of the sun and provides us the air we
breathe.
• The Atmosphere regulates the temperature of
the Earth and makes life possible on the Earth.
• From the outer space the atmosphere and the
ocean make the Earth look blue and so, it is
referred as Blue planet.
3. Composition of the Atmosphere
Nitrogen-78%
Oxygen-21%
Carbondieoxide-
0.03%
Argon-0.09%
Others-0.04%
Atmosphere
4. Nitrogen
• Plants and animals need Nitrogen to survive
but cannot directly breathe it in
• Plants get there nitrogen from the from the
help of bacteria in the soil or root nodules .
• Nitrogen –fixing bacteria take nitrogen from
the air and convert it into water soluble
compounds.
• Animals get there Nitrogen from plants or
from other animals .
5. Oxygen
• The oxygen is the second most plentiful gas in
the air
• All living beings need Oxygen to survive.
• The oxygen level in the air remains constant in
the due to photosynthesis and respiration
• In Photosynthesis the plants give out Oxygen
• Due to deforestation the oxygen cycle has got
effected.
6. Carbondieoxide
• Plants need carbondieoxide for the process of
Photosynthesis
• In the process of respiration all Hetrotrophs
release carbondieoxide.
8. Troposphere
• Lower most atmospheric layer ,it is closest to
the Earth.
• The density of air is thickest in the
Troposphere.
• Average height -13 km from Earths surface
• All weather changes occur in the this layer
9. Startosphere
• Extends upwards from the troposphere upto
50 kms
• Stratus means spreading out
• Commercial aircrafts , Jet plane, Hot air
balloons fly through this layer.
• This layer is less dense and less turbulent
hence is preffered to fly airplanes
• The stratosphere has the maximum
composition of ozone.
10. Mesosphere
Has a very cold
temperature.
A Meteorite burning in the
Mesosphere.
The coldest place on Earth
is the Mesopause which
lies between the
Thermosphere and the
Mesosphere.
It has a temperature of
-100ºc
11. Thermosphere
• Thermosphere’s temperature rises as the
altitude rises .
• All radio and satellite system remain in this
layer
• The lower part of the thermosphere is called
the ionosphere .
