A long period of time when there is no rain
When ice turns to water
The process of making the air, water or land worse, with chemicals, for example
Convert into reusable material
Keep safe or rescue
The part of the Earth`s atmosphere which protects the earth from the sun
An accident with nuclear power, usually causing radioactivity
When heat cannot escape from the atmosphere and the temperature on Earth goes up
The increase in the temperature on Earth
A large quantity of water that suddenly covers an area
Introduction some harmful things into the water, air, ground etc
An accident when oil comes out of its container, for example at sea
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