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If the temperature ____ rising, the polar ice caps will melt.

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Land pollution is responsible for damage done ___ natural habitat of animals.

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___ fumes from these vehicles are serious air pollutants.

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Air pollution occurs when the atmosphere contains gases, dust, or fumes in ___ an amount.

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When radiation goes into the land, air, or water, it is called radioactive ___.

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___ thermal pollution happens, the water temperature in streams, rivers, lakes, or oceans changes.

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Too much use of electric lights in cities may ______ light pollution.

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We saw many beautiful birds while we ____ in the lake.