holes are in the ozone layer a problem |
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holes is in the ozone layer |
2 |
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holes are in the ozone layer created |
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holes are in ozone layer formed |
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holes in the ozone layer occur |
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holes in the ozone layer appear mainly in the polar regions |
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holes in the ozone layer happen to be located closer to the poles |
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holes in the ozone layer tend to appear mainly in the polar regions |
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