Terrestrial ices contribute to the delicate balance between reflected and absorbed solar heat on Earth. Chemical and physical processes occurring in terrestrial ices, whether during the formation of crystalline ice from cooling water or in the form of snow or in ice cores, are some of the important processes that need to be well understood. The presence of organic and inorganic pollutants - whether through natural events or through human activity - influences both the physics and chemistry of terrestrial ices. Our understanding of thermal, pressure induced, and photochemical transformations of impurities in terrestrial ices are reviewed in this chapter.
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