Earth's atmosphere is a layer of gases that absorbs solar energy, protects life, and burns meteoroids. It consists of four layers: the troposphere (where weather occurs), stratosphere (containing the ozone layer), mesosphere (where meteors burn), and thermosphere (home to satellites). The atmosphere is primarily composed of nitrogen (78%), oxygen (21%), along with trace amounts of other gases.

2. Earth’s atmosphere
 Earth’s atmosphere is a layer of gases surrounding the planet.
 The Earth is surrounded by a blanket of air,
which we call the atmosphere.
Atmosphere:
 Absorbs the energy from the Sun
 protects us from high-energy radiation
 The atmosphere protects and supports life.
 It burns incoming meteoroids.

3. Blue layer is an atmosphere

4. Atmosphere act as a blanket to our
earth

5. Earth’s atmosphere
 Earth’s atmosphere is made of a mixture of gases called
air.
 Nitrogen gas makes up about 78% of Earth’s
atmosphere.
 The second most abundant gas is
oxygen, which makes up 21% of Earth’s
atmosphere.
 The third Argon (Ar, 0.9%).
 Carbon Dioxide (CO2, 0.03%).

6. Lets Understand It With Pizza

7. Layers of Atmosphere
The atmosphere has four layers
Thermosphere
Mesosphere
Stratosphere
Troposphere

10. Troposphere
 Lowest and thinnest layer
 17 km at equator, 7 km at poles
 90% of the atmosphere’s mass
 Temperature decreases with altitude
 6°C per kilometer
 Top of troposphere averages –50°C
 Where weather occurs
 Air is warmest at the bottom of the troposphere near ground level.
Higher up it gets colder
 Boundary between the troposphere, and the stratosphere is called
the tropopause
View of troposphere layer from an
airplane's window.

11. AEROPLANES Fly on Troposphere layer

12. Stratosphere
 Extends from 10 km to 50 km
Above the ground
 Here UV radiation are absorted
 Temperature increases with altitude
 Almost no weather occurrence
 No air mixing in this layer.
 Contains high level of ozone
 Ozone layer
 Upper boundary is called stratopause
temp which change slowly in stratosphere.
Stop changing here

14. Stratosphere
Troposphere

15. Mesosphere
COLDEST
 Extends to almost 80-85 km high
 Meteoroids get burn in this layer
 Most coldest layer(-100)C
 Temperature
decreases as altitude increases.
 The boundary between the
mesosphere and the next upper layer
is called mesopause.

16. Thermosphere
 Above the mesosphere and extends to almost
500 km high
 Hottest layer
 Temperature increases with altitude.
 The upper Thermosphere is called the
Ionosphere; it extends from 80 to 550 km
above the Earth's surface.
 Ionosphere absorb radiation from the sun and
become electrically charged.
 Electrically charged particles are called ions,
hence the name: the Ionosphere.
 Readily absorbs solar radiation
 Temperature can go as high as 1,500C
 Reflects radio waves.
 International space station are present in this
layer.

17. Found In THERMOSHERE Layer
INTERNATIONAL SPACE STATION

18. AURORAS
• An aurora is a natural light display in the sky, usually of greenish color but sometimes
red or blue.
• This natural phenomenon usually occurs in areas known as the 'auroral zone' near the
poles of the in the north & in the south.
• Aurora is caused by the collision of energetically charged particles with atoms in the
high altitude thermosphere within our atmosphere.
• The Sun contain particles which gets pulled into the Earth's magnetic pole fields.
• As they accelerate towards the Earth, collisions occur between these ion particles and
nitrogen and oxygen atoms in our atmosphere, releasing energy in the form of amazing
aurora lights

19. Layers
of
Atmosphere

21. Layers of the
Atmosphere
The four layers of the
atmosphere include:
1. the troposphere, where we
live;
2. the stratosphere, which
contains the ozone layer;
3. the mesosphere, where
meteors burn; and
4. the thermosphere, where
satellites orbit Earth.