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| Description: Is Earth Unique? The right planet Correct size to support life as we know it Molten metallic core Plate tectonics The right location – distance from the Sun The right time Atmosphere has evolved over time Geologic events have shaped Earth Birth of a Planet The history of Earth began about 13.7 billion years ago with the Big Bang This provided the elements, along with material from former stars, to form the solar system As material collected, high velocity impacts of matter, called planetesimals, caused Earth’s temperature to increase Formation of Earth Iron and nickel melted and sank to form the metallic core while rocky material rose to form the mantle and Earth’s crust Molten metallic core Picture Stats: Views: 329 Filesize: 1.15MB Height: 870 Width: 710 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=39627 |