warm and rises too. As the warm air
continues to rise, the surrounding air swirlsin to take its place and the water from the
sea surface also comes up with the air as you
have seen in activity 10. As the warmed
moist air rises and cools off, the water in the
air forms clouds.
The whole system of clouds and winds spins and
grows, fed by the ocean’s heat and water
evaporating from the surface. See the figure (10)
Fig. 10
These kinds of satellite images help us to
predict the path of the cyclones to some
extent.
Factors Contributing to Cyclone:
Factors like wind speed, wind direction,
temperature and humidity contribute to the
development of cyclones. In India cyclones
usually occur in the month of May-June and
October-November. More cyclones tend to
occur on the eastern side i.e. towards Bay of
Bengal
DESTRUCTION BY CYCLONES:
Cyclones can be very destructive. The main
effects of cyclones include heavy rain and,
strong wind. The destruction of a cyclone
depends mainly on its intensity, its size and
its location.
Fig. 11
• Have you heard or seen any experiences
of cyclones? Write about these in your
notebook.
• Collect information regarding cyclones
from news papers. Prepare a scrap book
with news paper cuttings followed by
small report prepared by you.
CYCLONES – Do’s and Don’ts:-
• We should not ignore the warnings issued
by the meteorological department
through T.V., Radio or news papers.
Pass on the information to others and
ignore rumors.
• When a cyclone alert is on for your area,
continue normal working but stay alert
to the radio warnings.
• We should make necessary arrangements
to shift essential household goods,
domestic animals and vehicles, etc. to
safer places.
• Switch off electrical mains in your house.
• Keep ready the phone numbers of all
emergency services like police, fire
brigade, and medical centers.
• Pack essentials for yourself and your
family to last a few days, including
SCERT TELANGANA
medicines, special food for those who cotton ball inside the bottle by
blowing air. Are you surprised? Why did this
happen? Think about it and discuss with your
friends.
B. Can you blow out the ball from funnel?
Fig 14
Take a funnel and ball, keep the funnel in your
mouth as shown in figure 14. Keep the ball in
the funnel. Blow air through the funnel and
try to send out the ball from funnel. What
happens? Have you succeeded in sending the
ball out?
Fig. 15
And then place the ball on your hand and put
the funnel over the ball as shown in figure 15
Now blow air forcefully through funnel and
try to blow out the ball from the funnel (while
blowing air, remove hand).
· What did you observe?
· What did you expect?
· What happens?
Try to answer and discuss with your friends.
C. Flow of air
Fig 16
Take a large plastic bottle and a two holed
rubber cork that fits firmly into its mouth.
Also take two glass tubes. Tie a coloured
balloon to the lower end of one of the glass
tubes. Insert the glass tubes into the two holes
of the cork. The glass tubes should fit tightly
in the holes.
Close the mouth of the bottle with the cork
and seal it with sealing wax to make the bottle
airtight. The balloon should be inside the
bottle as shown in Fig. 16.
Now suck air out of the bottle through the tube
that doesn’t have a balloon attached to it.
· What happens to the balloon?
· Why do you think this happe
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