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Oxygen
Importance:
Oxygen is used by plants and animals for
respiration
It also supports burning of materials (i.e.
combustion)
Oxygen supports animal life
Oxygen combines with water vapour for chemical
weathering
Oxygen is also used for industrial purposes
Carbon Dioxide
importance:
It is required by plants for photosynthesis
Carbon dioxide combines with water to produce
weathering ( carbonation)
Green plants take in carbon dioxide
Carbon dioxide absorbs heat to control atmosphere
temperature in the carbon cycle…read more

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Nitrogen
Importance:
Nitrogen is required by plants for the
manufacturing of proteins
It combines with water to provide food for
plant growth
Nitrogen in soil can be converted to nitrate in
the soil
Nitrogen gas is used in electrical industry
Ozone
Importance:
It acts as a blanket to the earth
It protects the earth from the ultra-violet
rays
It protects the earth and its living things
from the effects of the ultra-violet rays such
as skin irritation and cancer.…read more

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Water Vapour
Importance:
It is important for rain formation
The resultant rain is used by plants and
animals in the process of chemical
weathering
Water vapour moderates atmospheric
temperature
Rain
Importance:
It provides water for human
consumption
It provides water for agriculture
It reduces temperature and feeds rivers
with water
It is a source of underground water…read more

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Sunlight/Solar energy
Importance:
It provides solar energy for drying
It is used for heating, cooking, and cooling
processes
It is used for generating electricity
It is required by plants for photosynthesis
It is a source of vitamin D
It is useful in food chain
It is useful for desalination
Wind
Importance:
Wind can be harnessed for windmills and
used for pumping water
It aids drying
It is used in meteorological studies
It aids sailing of ships and aviation
It is useful for sporting e.g. yachting
It is used for dispersal of seeds
It is useful in winnowing and pollination…read more

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Ways in which Human Activities
Affect the Composition of the
Atmosphere
Emission of carbon dioxide through burning
fossil fuels such as coal, petrol, and gas
Deforestation
Use of chemical, biological, and nuclear warfare
Release of toxic waste
Bush burning
Pollutants emitted from industrial activities
Pollutants emitted from mining and construction
works…read more

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