This is an example of Venus volcanism.
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NASA/JPL
Volcanic Rises
Volcanic rises are more like islands than a continents. They are broad, sloping highlands over 1000 km across. They are cut by deep troughs 100-200 km across and have shield volcanoes near the top. Measurements suggest that there is hot magma deep beneath these rises that helps to buoy them up and support their mountains, as shown in this picture.
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