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Description: Early Earth was initially a homogeneous mixture of elements with no continents or oceans. (a) Molten iron sank to the center and light material floated upward to form a crust. (b) As a result, Earth has a dense iron core and a crust of light rock, with a mantle of intermediate density between them Picture Stats: Views: 771 Filesize: 232.8kB Height: 837 Width: 1350 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=15967 |