Ice cores contain very detailed information, including carbon dioxide levels, snowfall, temperature, volcanic activity, solar variability, and many other factors — suffice to say that they’re very useful for paleoclimatic research.
Ice cores have been helpful in piecing together climate history. Snow contains particles in the air, like nitrate, trace metals and radioactive fallout. From analysis of the ice, and even from air bubbles trapped in the layers, scientists can learn about the atmospheric conditions ranging thousands of years and locate patterns leading to climate change.
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