The disasters or hazards which are occurring on the earth surface..

1. EXOGENOUS
HAZARDS

2. CYCLONES:
•A cyclone is a large scale air mass that rotates around a strong center
of low atmospheric pressure.
•Cyclones are characterized by inward spiraling winds that rotate
about a zone of low pressure.
•A low-pressure area, low, or depression is a region on the
topographic map where the atmospheric pressure is lower than that of
surrounding locations.
•Low-pressure systems form under areas of wind divergence that
occur in the upper levels of the troposphere.

6. • A hurricane is a cyclone with winds exceeding 74 miles per hour,
while a tornado is created from thunderstorms and the wind tunnel is
much narrower.
• A typhoon is the name for a cyclone in the northwest Pacific region.
•The main effects of cyclones are heavy rainfall, strong winds, land
falls and tornadoes.
•The destruction of a cyclone depends upon the intensity of the
winds.
•The worst cyclone in Australia was in 1974 called cyclone Tracy
which devastated Darwin and Northern Australia.

8. TYPES OF CYCLONES?
TROPICAL CYCLONES:
•The Tropical cyclones form over the Atlantic, Pacific and the Indian
Oceans, mostly develop during summer.
•Hurricanes and typhoons are also types of tropical cyclones.
•Tropical cyclones are called category 1,2,3,4, or 5.
•The number increases with the increase in their intensity and wind
speed.
•A category 1 cyclone is weak and has a speed of 74-95 mph.
•A category 5 cyclone is above 155 mph and is extremely disastrous
and dangerous.

10. POLAR CYCLONES AND MESOCYCLONES:
•Other types of cyclones are Polar cyclones and mesocyclone.
•Polar cyclones occur in Polar Regions in winter months in
Greenland, Siberia or Antarctica.
•A mesocyclone is when a part of a thunderstorm cloud starts to spin
and forms a tornado.