Page 78 - Innovator's Science-8

If you are outside :
Science • Avoid taking shelter under tall trees or walls.
Bytes
• Avoid isolated sheds, run in open areas.
Testimony
Lightning is ho er than • Try to get into a car or a bus, or take shelter inside building. Do not
the surface of the Sun - it touch the metal parts of the car or bus.
can reach 30,000°C!
The sound of thunder • Stay away from water bodies. Water conduct electricity. If you are in,
comes a few seconds move out to a safe shelter.
later because sound
travels much slower than If you are inside :
light.
• Close the windows and doors tightly. Draw blinds over the windows.
This will prevent glass sheltering into the house.
• Do not touch electrical equipments or telephones.

• Keep listening to a battery operated radio for latest information.
• Avoid contact with electrical equipments or cords.

• Avoid corded phones.

Fill in the blanks using the words given in the box.
Run Through
land low windsock tornado anemometer
Intellectual Development
1. The high speed winds blow to produce ______________ pressure.
2. In ______________ breeze, the air moves from land to sea.
3. Wind speed can be measured by a device called ______________ .
4. _____________ can measure both the strength and the direction of the wind.
5. A ______________ appears as a rotating funnel-shaped cloud.

CYCLONES
The word cyclone is derived from the Greek word ‘cyclos’ meaning the

coils of a snake. A cyclone is a huge revolving storm caused by very high
speed winds blowing around a central area of low pressure zone over the
ocean.

Formation of Cyclones

The formation of a cyclone is a very complex process. Factors like wind
speed, wind direction, temperature and humidity contribute to the
development of cyclones.

• The sun heats the surface of ocean water. The warm water in turn
heats the air above it. This causes a low pressure on a vast area of the
ocean. Due to the low pressure, the moist air from the ocean surface

begins to rise rapidly. This creates a strong upward wind that rotates
spirally.

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Science-8