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Tharsis Tholus (tholus = dome) lies just to the north of the three Tharsis Montes. Tharsis Tholus is the smallest of all the Tharsis volcanoes. Although the volcano is small compared to other Martian volcanoes, it would be very large if it were on Earth; Tharsis Tholus is about 150 km(93 mi) across and 8 km (5 mi) high, about the same size as Mauna Loa. Crater-count analyses can tell us the relative age of a planetary surface, and Tharsis Tholus appears to have been dormant for the past 2 billion years. |