Volcanoes on Venus


This Magellen oblique radar image shows the lay of the Alto Regio region of Venus much better than a normal satellite image. The small dome in the middle on the left is a volcano that was not apparent from the normal 'map' view.

This false-color image shows the volcano Sapas Mons, which is approximately 250 miles wide and nine-tenths of a mile high. The flanks are made of numerous overlapping lava flows. The dark flows on the lower right are thought to be smoother than the brighter flows near the central part of the volcano. The large, flat-topped masses near the summit are thought to have formed when underground chambers of magma were drained through other underground lava tubes. This volcano and 4 others in this region of Venus are thought to arise from upwellings of large volumes of magma known as hot spots.


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