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| Description: (a) Tar sands from Alberta, Canada. (b) It takes 2 tons of sand to make a barrel of oil. This shovel suggests the enormous scale of tar-sand extraction. Picture Stats: Views: 868 Filesize: 618.51kB Height: 771 Width: 2034 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=5350 |