This is an image of a Venusian volcanic dome.
Click on image for full size
NASA/JPL
Venus Domes
These domes may look a little bit like craters, but they are really
flat-topped mountains.
Mt Pelee in Martinique, West Indies, and Lassen Peak and Mono domes in California are examples of terrestrial lava domes.
These domes are built the same way some islands are built on Earth, by a hot plume of material from the deep interior of Venus, which rises to the surface, pushing out the crust and causing volcanism.
Among the different kinds of domes exhibited by Venus are:
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