This is an example of Venus volcanism.
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Volcanic rises are more like islands than a continents. They are broad, sloping highlands over 1000 km across. They are cut by deep troughs and have shield volcanoes near the top. Measurements suggest that there is hot magma deep beneath these rises that helps to hold them up, as shown in this picture.
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This image clearly shows a bed where something once flowed. Without proper measurements, scientists can only guess what sort of liquid may have flowed through this channel. On Earth, such channels might...more