| 21. | In typical unpolluted temperate streams of Europe and North America, certain insect taxa predominate.
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| 22. | He said he had come to Perth from Sydney to find unpolluted water for shelling.
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| 23. | The upper portion of PBonia is comparatively unpolluted, therefore trout can be found there.
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| 24. | "It's evidence that this ocean is clean and environmentally unpolluted ."
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| 25. | If the ore bed is left undeveloped and unpolluted, the beds can be mined indefinitely.
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| 26. | The unpolluted natural environment and the beautiful scenery present ideal conditions for trip out of town.
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| 27. | The headwaters of North Mahanoy Creek are in unpolluted springs and surface runoff near Locust Mountain.
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| 28. | It is pristine and unpolluted, and its sparkling waters flow into a labyrinth of quiet coves.
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| 29. | However, unpolluted rain can also contain other chemicals which affect its pH ( acidity level ).
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| 30. | So far, the beach remains unpolluted and an annual surfing competition is starting to attract international attention.
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