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Tharsis Tholus
Video
Tharsis Tholus measures about 150 kilometers (93 miles)
across and 8 kilometers (5 miles) high. The east and west flanks are indented giving
it a strange appearance. One possible cause for its appearance is that when the lava
supply drained away, the center of the volcano collapsed. An alternative is that big
slump areas carried off portions of the flanks, giving it the broken appearance.
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