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Natural Hazards and Disasters

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India Physical Environment

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Geography

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When can a hazard become a disaster?


Any hazard can become a disaster when the magnitude of destruction and damage caused by it is very high.
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Why are there more droughts in the central and western India ?

In central and western India, the droughts are more frequent because of the following reasons:


1. The monsoons do not occur in these areas frequently.


2. The rainfall is about 75 cm per annum.


3. The intensity of monsoon winds becomes weak as they reach in these areas.

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Why are there more earthquakes in the Himalayas and in the north-eastern region of India ?

The Indian plate is moving at a speed of one centimetre per year towards north and north eastern direction and it is obstructed by Eurasian Plate. 

As a result of this, both the plates are said to be locked with each other resulting in accumulation of energy at different points of time. Excessive accumulation of energy results in building up of stress, which ultimately leads to the breaking up of the lock and the sudden release of energy causes earthquakes along the Himalayan arch.
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How are the floods in eastern India different from the ones in western India ?

The floods in eastern India are different from the ones in western India as the floods are frequent in eastern India while the floods are not so frequent in western India.
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What are the basic requirements for the formation of cyclone ?

The basic requirements for the formation of cyclone are as mentioned:


1. Large and continuous supply of warm and moist air.


2. Strong Coriolis force.


3. Unstable condition through the troposphere that creates local disturbances around which a cyclone develops.


4. Absence of strong vertical wind wedge.

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