I AM HAFIZ MUHAMMAD WASEEM from mailsi vehari BSc from science college Multan MSC university of education Lahore i love Pakistan and my teachers

1. HAFIZ
MUHAM
MAD
WASEEM
LAHOR
E
PAKIST
AN

2. UNIVESITY OF
EDUCATION LAHORE
PAKISTAN

3.  Blanket of gases which surrounds
Earth
 Gases surrounding a star or
planetary body held in place by
gravity
 A layer or a set of layers of gases
surrounding a planet or other
material body

4. Ancient Greek ἀτμός (atmos),
meaning 'vapour', and σφαῖρα
(sphaira), meaning 'ball' or
'sphere'

5. 78% nitrogen,
21% oxygen,
0.9% argon, and
0.03% carbon dioxide
small percentages water vapor
traces of dust particles,
pollen, plant grains and
other solid particles.

8.  Exosphere.
 Ionosphere.
 Thermosphere.
 Mesosphere.
 Ozone Layer.
 Stratosphere.
 Troposphere.
 Earth's Surface

10.  It extends from Earth's surface to
an average height of about 12
km (7.5 mi; 39,000 ft)

13. The coldest layer of the atmosphere is
mesosphere

14. The hottest layer in the atmosphere
thermosphere

16.  contains the air we breathe;
 protects life from harmful radiation from
the Sun;
 helps keep the planet's heat from the Sun
from escaping back into space;
 is a major element of the water cycle;
 keeps the climate on Earth moderate
compared to that of other planets.

17.  Air pollution occurs when harmful or
excessive quantities of substances are
introduced into Earth's atmosphere.
 Sources of air pollution include gases
(such as ammonia, carbon monoxide,
sulfur dioxide, nitrous oxides, methane
and chlorofluorocarbons), particulates
(both organic and inorganic), and
biological molecules.

18.  "Earth's Atmosphere Composition: Nitrogen,
Oxygen, Argon and CO2". Earth How. 2017-07-
31. Retrieved 2019-10-22.
 Seki, K.; Elphic, R. C.; Hirahara, M.; Terasawa, T.;
Mukai, T. (2001). "On Atmospheric Loss of
Oxygen Ions from Earth Through Magnetospheric
Processes". Science. 291 (5510): 1939–
1941. Bibcode:2001Sci...291.1939S. CiteSeerX 10.1.
1.471.2226.

19. THANK YOU ALL