firn snow

firn snow

[′fərn ‚snō]
(hydrology)
firn old snow
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The researchers, who compared today's air samples with air trapped in polar firn snow air collected between 1978 and 2012 in unpolluted Tasmania, revealed that all four new gases have been recently released, while two are significantly accumulating.
Four new 'ozone layer-destructing' man-made gases found in atmosphere

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