ATMOSPHERE ( LAYERS OF ATMOSPHERE, STRUCTURE AND COMPOSITION )

1. BY- GEOLOGICA
ATMOSPHERE
AND IT`S
STRUCTURE

2. ATMOSPHEERE – The atmosphere is
a thick gaseous envelope which
sorrounds the earth from all sides and
is attached to the earth`s surface by
gravitational force.

3. The atmosphere is
composed of –
1. Gases
2. Vapour
3. Particulates

4. Structure of the
atmosphere
structurally atmosphere
is divided into 4 parts .
1.Troposphere
2.Stratosphere
3.Mesosphere
4.Thermosphere

5. 1. TROPOSPHERE-
• Lowermost layer with all weather phenomenon.
• Temperature decreases with increasing height at
the rate of 6.5*/km, is called normal lapse rate.
• The average height of the troposphere changes
from equator towards poles (decreases).
• Average height of tropsphere is about 16km.
TROPAUSE -
• Upper limit of the troposphere is called tropause.
• Tropause is about 1.5 km thick.
• Troposphere is called zone of mxing while
•The tropause is called zone of mixing stop.

6. 2. STRATOSPHERE -
• Above the tropopause with less weather
phenomenon.
• Temperature increases and becomes 0*c at
50km.
• It is divided into two parts ozonosphere
(17-35km ) an dremaining part (35-50).
STRATOPAUSE -
• Upper limit of the tstratosphere is called
stratopause.

7. 3. MESOOSPHERE -
• Temp. starts decreasing and becomes -80* at
it`s upper limit.
• It extends between 50-80 km.
MESOPAUSE -
• Upper limit of the mesosphere is called
mesopause.

8. 4. THERMOSPHERE-
• Temperature increases rapidly and becomes
1700*c at it`s upper limit.
• In this region we are unable to measure the
temperature by ordinary thermometer because
of extremely low density.
• Extends from 80-640km.
• In the ionosphere we found D(60-99km),
E(99-150),F (150-380)& G (400-above) layers.
IONOSPHERE -
EXOSPHERE -
• This is the uppermost layer extending beyond 640km