Maui was formed out of two volcanoes that were born on a hot spot on the ocean's floor. With each eruption, the volcanoes spewed a new layer of lava and their summits eventually rose out of the water to become dry land.
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West Maui Volcano is an extinct volcano whose evolution includes shield (1.6 to 2.0 million years old), postshield (1.5-1.2 million years old), and rejuvenated stages. The rejuvenated stage is represented by only a handful of vents and flows, located mainly near the town of Lahaina.
Haleakala, the only active volcano on the Island of Maui, erupted most recently between about 600 and 400 years ago. In the past 1,000 years, at least 10 eruptions produced lava flows and tephra cones from the rift zone that crosses the volcano from southwest to east and through Haleakala Crater.
Deadly wildfires in Hawaii, which killed over 100 people and forced thousands to evacuate, were fueled by a mix of land and atmospheric conditions that can create fire weather. A massive blaze destroyed much of the historic town of Lahaina, on Maui, and the search for victims continued as hundreds remained missing.
Rising gradually to more than 4 km (2.5 mi) above sea level, Hawaii's Mauna Loa is the largest active volcano on our planet. Its submarine flanks descend to the sea floor an additional 5 km (3 mi), and the sea floor in turn is depressed by Mauna Loa's great mass another 8 km (5 mi).