Page 77 - Innovator's Science-8

result, cold wind rushes north- wards from the south pole and
southwards from the north pole to replace the gap generated by the

rising warm air at latitude of about 60°.
The flow of winds is not exactly vertically north to south or from south to
north as you can see in the given figure. A change in the direction of

wind is observed due to rotation of the Earth.

Uneven Heating of Land and Water
We already know that water is a bad conductor of heat so there is always

an uneven heating pattern seen in case of land mass and water bodies.
In summer, the land mass of northern India is much hotter than the
Science surrounding water in the oceans most of the time. The air above the
Bytes

land heats up and rises and the wind from the ocean carrying water
Testimony
The word monsoon vapour flowing. These are monsoon winds and cause rainfall in most
comes from the Arabic parts of India.
word mausim, meaning
"season." In winter, the winds from the land blow towards the ocean as the land is
India's monsoon winds cooler than the water bodies. These winds, called winter monsoon, bring
reverse direc on every six
months a unique feature scanty rainfall to coastal Tamil Nadu as they take moisture while blowing
not found in most other from Bay of Bengal.
parts of the world.
THUNDERSTORMS

A thunderstorm is a storm accompanied
with thunder. Formation of a thunderstorm
.
needs :
• Moisture to form clouds and eventually
rain.

• Front like beach or mountains that help Thunderstorms
in lifting the warm air upwards.

• Rapidly using warm air (due to the sun's heat, the temperature of a
place rises.) The rise in temperature warms the air and creates strong
wind which rise in the upward direction.

Water droplets are also carried upward along with these winds. These
water droplets then freeze and falls back on the earth. This movement of
rapidly rising warm air and the falling droplets of water creates lightning

and sound.

What precautions must be taken during a Thunderstorm?
We must take the following precautions during a thunderstorm.

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Science-8