3.Find words that best complete the sentences. Each line corresponds to one letter. Some letters have already been given.



1. Car _ x _ _ _ _ _ emissions are a major source of lead pollution in the atmosphere.



2. The company is very environmentally friendly: all the products come in

_ _ _ d _ _ _ _ d _ _ _ _ packaging.



3. Using energy efficiently reduces the emission of _ _ _ _ _ h _ _ s _ gases.



4. Oxygen in the atmosphere forms a screen – the ozone layer – which filters the

_ _ _ _ a _ _ _ l _ _ rays of the sun.



5. The Chernobyl nuclear power plant accident released huge amounts of r _ d _ _ _ _ _ n into the environment.



6. The dinosaurs _ _ _ d out 65 million years ago.

7. _ m _ _ _ is the major cause of air pollution in big cities.