This is an example of Venus volcanism.
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NASA/JPL
Volcanic Activity of Venus
The Magellan mission to Venus confirmed that the surface of Venus is definitely volcanic. As shown in this picture, lava flows extend to hundreds of miles across the plains in the foreground.
The surface of Venus is an example of the fact that there are many different kinds of volcanic activity besides the building of volcanic cones such as those found on Earth. Among the different kinds of volcanism on Venus are:
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