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Venus Tectonics

Because Venus is closer to the sun, it was always hotter than the Earth. This appears to have favored the formation of silicate rather than carbonate rocks. That means that carbon dioxide belched out by volcanoes in the distant past piled up in the atmosphere, trapping heat and making the surface hot enough to melt lead. A new study shows that Earth-style plate tectonics can't exist on Venus because the shallow rocks are so hot that any rifting heals itself before it can get moving. This is important because on Earth it's clear that plate motions can keep themselves going once they get started. This can't work on Venus because the plates never get started in the first place.