Earth as a home for human Being Unit No: 03
- Life exists on Earth
in different shapes. Therefore, it is also called “The living planet”.
- Natural spheres of the earth:
- Atmosphere: Up to a certain
height the earth is surrounded by a layer of air. This layer is called the atmosphere.
- Clouds, rain, and storms all are formed
in the atmosphere.
- Atmosphere is composed of different gases in which Nitrogen is 78%
and oxygen 21%.
- Lithosphere: The upper most solid layer of
the earth on which we live is called lithosphere.
Its average depth is 35km. - Hydrosphere: 71% of the earth surface is comprised
of water in different shapes i.e. oceans, rivers etc. this is called hydrosphere.
- Hydrosphere is the habitat of numerous Equatic
plants and animals.
- Biosphere: It is the sphere of life
comprised of plants, animals, and human beings. It is dependent upon the other three
spheres.
- Climate: The
average weather condition of a place for a long period of time is called
climate.
- The 90% population of the world is living in plain areas.
- The area of forest should at least be 25-30% of
a country.
- Forest area is only 5% in Pakistan.
- Roof Gardens: The world’s most dense forests are found
near the equator. These are called Roof Gardens.
- Evaporation: The process of conversion of water into vapors.
- Clouds, rain, and storms all are formed
in the atmosphere.
- Atmosphere is composed of different gases in which Nitrogen is 78%
and oxygen 21%.
Lithosphere: - Lithosphere: The upper most solid layer of
the earth on which we live is called lithosphere.
- Its average depth is 35km.
- Hydrosphere: 71% of the earth surface is comprised
of water in different shapes i.e. oceans, rivers etc. this is called hydrosphere.
Hydrosphere - Hydrosphere is the habitat of numerous Equatic
plants and animals.
- Biosphere: It is the sphere of life
comprised of plants, animals, and human beings. It is dependent upon the other three
spheres.
Climate: - Climate: The
average weather condition of a place for a long period of time is called
climate.
- The 90% population of the world is living in plain areas.
- The area of forest should at least be 25-30% of
a country.
- Forest area is only 5% in Pakistan.
- Roof Gardens: The world’s most dense forests are found
near the equator. These are called Roof Gardens.
- Evaporation: The process of conversion of water into vapors.
MCQs
.
Environment is the…………….that surrounded any living organism.
a) Place
b) People
c) Things
d) All of the above
d
The thin layer of air surrounds the earth is……
a) Hydrosphere
b) Atmosphere
c) Lithosphere
d) Hemisphere
b
Atmo comes from the Greek word
meaning…
a) Water
b) Air
c) Ground
d) Life
b
Clouds, rain and storm all are form in which of the following sphere?
a) Hydrosphere
b) Atmosphere
c) Lithosphere
d) Hemisphere
b
