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This Concept Map, created with IHMC CmapTools, has information related to: MeliaPerson, Oldest Rock ???? ????, Fossil evidence of first land plants ???? 250-500 million years ago, Appalachian Mountains begin to form ???? 250-500 million years ago, Fossil evidence of first life on Earth ???? More than 500 million years ago, Earth Formed ???? More than 500 million years ago, ???? ???? More than 500 million years ago