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Question of the Day Venus - Surface and Geological History Volcanism and Tectonics How does the level and scale of volcanism and tectonics on Venus compare to Mars and the Moon? What is "Blob Tectonics"? Impact Craters How and Why is the crater population on Venus different from the crater population on the Moon and Mars? What does the crater population on Venus tell us about the history of the surface? How do we know the timing of the geoloical events on the surface of Venus?