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This Concept Map, created with IHMC CmapTools, has information related to: Plate Tectonics on Venus, Plateaus due to thin crust, Plate Tectonics shown by Volcanic Rises, mysterious event could have been catastrophic, Plate Tectonics shown by Plateaus, thick crust didn't allow cooled magma, mysterious event took place about 1 billion years ago, thick crust measured at about 60 miles, mysterious event could have been tectonic, cooled magma to break through crust, thin crust allowed cooled magma, thin crust became thick, Venus once had Plate Tectonics, thick because of a mysterious event, Plate Tectonics must occur with thin crust, Volcanic Rises due to thick crust