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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Mount St. Helens & Other
Volcanoes