It would be our ozone layer, having to much of it creates global warming. Another would be carbon monoxide from forest fires or just fires etc.
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~Bob Ross®
The water cycle is also know as the hydrologic cycle.
The right answer is answer d.
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your answer should be x = 17
Platinum is found in its pure native form, or in platiniridium, a natural alloy of platinum and iridium. Platinum is present in thin sulfide layers in certain maficigneous bodies and is mined in Canada, Russia, South Africa, the USA, Zimbabwe and Australia. Some platinum is obtained as a by-product of copper and nickel processing.