Vocabulary: Unit 2: Looking ahead

Rain that contains lots of pollutants is called .......... rain.

Coal, oil and gas are examples of .......... fuels.

Types of animals in danger of extinction are called .......... species.

The part of the stratosphere which limits the amount of ultraviolet radiation reaching the Earth is the .......... layer.

The process by which gases trapped in the atmosphere cause the planet to heat up is the .......... .

Lack of water is called water .......... .

Poisonous gases produced by the engines of non-electric vehicles are called exhaust .......... .

Because of global warming, freak weather conditions are more common, with periods of drought followed by .......... rain.