"Ma'uka" -- Volcanoes & Deep Canyons - maui-mike

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Haleakala'a Summit Basin (from the Visitor Center) -- Looking down into Pu'u Ula'ula Crater, the cinder cone formed by the last volcanic activity of Haleakala. The different colors of the cinders is caused by oxidation (basically "rusting") of the cinders and other finer-grained materials of the basin. Volcanic "bombs" more than a meter in diameter litter the lower slopes of the basin; these were explosively thrown out of the erupting cinder cone.

haleakalahawaiian volcanoesgeology of mauigeology of hawaiimauivolcanohaleakala national park