| http://www.w3.org/ns/prov#value | - extracted from hundreds or even thousands of metres of accumulated ice and snow, ice cores are a key tool for mapping the earth???s changing climate. the trapped air bubbles, much like the rings of a tree, can be studied to determine the historical atmospheric composition of the planet. the sample above was collected by Dutch scientists from the Oeschger Centre for Climate Change Research in Antar
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