Researchers used computer models to reconstruct the impact that created Crater Mead, the largest
“Venus probably had what is called"Stagnant lid" during impact, "said Evan Bionnes, Brown's graduate student and lead author of the study. "Unlike Earth, which has an 'active cover' with moving plates, Venus appears to have been a single-plate planet, at least before this impact."
On Earth, evidence of plate tectonics can be foundWorldwide. There are huge cracks, called subduction zones, where bands of the earth's crust extend into the bowels. Meanwhile, new crust forms in the mid-ocean ridges, where lava from deep within the Earth flows to the surface and solidifies. Data from the orbiting spacecraft revealed cracks and ridges on Venus that are a bit like tectonic elements. But Venus is covered in a dense atmosphere, making it difficult to finally interpret fine surface details.
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