Page 254 - New Medley 5 Semester 2

that causes drought. Hot dry winds, very high temperature and evaporation of

moisture from the soil can result in drought-like conditions.

Deforestation for developing towns and industries and overgrazing are the major
causes of droughts.

India has faced three major droughts in the twentieth century – 1904-05, 1965-66 and

1986-87. ese droughts are known as the droughts

of the century and had a major impact on almost

one-third of the country.

Droughts can be prevented by a orestation, i.e.,
growing more and more trees, and by harvesting

rainwater. Trees give out water vapour during
transpiration and help in bringing rains. A drought-affected field

• Understanding

Write Yes or No.

1. e sudden shaking of ground is called tidal waves.

2. Hot molten rock that comes out on the ground is called lava.

3. Tsunami waves are caused in the sea.

4. Waterlogging damages the roots of plants.

AT ONE GO

 Earthquake is the sudden shaking of ground that causes damage to life and property.
 Volcanoes are openings on the earth’s surface which give out hot molten lava.

 Tsunamis or tidal waves are huge sea waves caused due to undersea earthquakes.
 Floods are caused due to heavy rains and they cause destruction to life and property.

 A condition of less or no rains over a long period is termed as drought.

REMEMBER THESE TERMS

Quiver : To shake

Cyclone : A violent storm with an intense spiral accompanied by strong winds and heavy
rains
Hurricane : Name used for cyclone in American continent

Seismograph : Instrument used to record seismic waves

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