Q8. Answer the following questions.
a) What is meant by the term ‘Atmospheric Pressure’? Name the instrument used to
measure it.
b) What are trade winds? How are they caused?
c) What are doldrums? Why are they called so?
d) How is atmospheric pressure caused?
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Answer:
a) The force exerted by a column of air on the earth surface.
Atmospheric pressure - Aneroid Barometer.
b) The trade winds are winds that reliably blow east to west just north and south of the equator.
Trade winds are caused by strong warming and evaporation within the atmosphere around the equator where the warm air rises rapidly, carrying a lot of moisture.
c) It is an oceanic belt that circles around the globe.
d) Atmospheric pressure is caused by the gravitational attraction of the planet on the atmospheric gases above the surface
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