change each pair of simple sentence into compound sentence by using and , or but whichever is most appropriate.

1. most rubbish is buried in quarries. this levels out the land.
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2. no one wants a rubbish dump . everybody else produces rubbish.
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3. waste can be burned . this can pollute the atmosphere.
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4. Modern supertankers are 390 meters long.they carry more than 450,000 tons of oil
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5. a river may make long journey.at the end of it's journey it will dump all its pollution into the sea.
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