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Puu Waawaa is a trachyte pumice cone on the northern flank of Hualalai volcano. Photo by Scott Rowland.

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Just north of Puu Waawaa we can see the distal end of the great Mauna Loa lava flow that was produced in 1859. This is the longest historic flow in Hawaii (it is over 50 km long) and is used by numerous geologists around the world as an analog to very long lava flows on the Moon, Mars and Venus. Photo by Scott Rowland.

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The third volcano (after Kilauea and Mauna Loa) that must be considered active is Hualalai volcano, which last erupted in 1801. The summit area of Hualalai has a very prominent rift zone and numerous deep craters. These three views show some of these landforms.

Copyright by P. Mouginis-Mark