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| Description: - Scientists extract deep cores of material that have been deposited over long periods, with more recent material constantly burying older material. - Cores include the bones and shells of plankton and other animal life. - The information contained in the oxygen in the calcium carbonate is most important for determining past climates. Picture Stats: Views: 1909 Filesize: 64.85kB Height: 633 Width: 431 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=31073 |