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This Concept Map, created with IHMC CmapTools, has information related to: Tectonic Venus CMAP, older than Volcanic Rises, Volcanic Plateaus have impact craters, Magma Plumes to break through, Evidence does not support Tectonic plates, 60 miles thick so magma, 24 miles thick which allowed Magma Plumes, Evidence indicates Magma Plumes, 24 miles thick but is presently 60 miles thick, Evidence does not contradict Tectonic plates, domed bulges which are Volcanic Rises, 60 miles thick possibly because lack of water, impact craters which means they are older, break through and form Volcanic Plateaus, lithosphere was once 24 miles thick, Was there plate tectonics on Venus in the past? scientists found Evidence, Was there plate tectonics on Venus in the past? has lithosphere, magma pushes up against lithosphere to form domed bulges, Magma Plumes from Hotspots, Evidence indicates Volcanic Plateaus, 60 miles thick took place 1 billion years ago