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melt
a long period of time when there is little or no rain and crops die
drought
a long row of mountains
mountain range
a forest in a tropical region of the world where it rains a lot
rainforest
a low area of land between mountains or hills, usually with a river flowing through it
valley
a large area of land with few plants and little water and where the weather is always dry
desert
a situation in which a lot of water covers an area that is usually dry, especially when a river becomes too full
flood
the process of damaging the air, water, or land with chemicals or other substances
pollution
the process in which heat is unable to escape from the atmosphere and causes the temperature of the Earth to rise
greenhouse effect
The rise in temperature is called
global warming
to change waste materials such as newspapers and bottles so that they can be used again
recycle
an accident when oil comes out of its container, for example at sea
oil spill
the part of the Earth’s atmosphere which protects the earth from the sun
ozone layer
an accident with nuclear power, usually causing radioactivity
nuclear disaster
a large area of land covered by trees and other plants growing close together
forest
