Haleakalā’s crater is actually not a volcanic crater or caldera. In the last 1500 years, erosion has carved out an area about 7 miles long, 2 miles wide, and nearly 3000 ft from the bottom to the top of the crater. The rate of erosion in the crater is incredibly fast for a variety of reasons. There is practically no vegetation in the crater or at the summit and because of this, there isnʻt a root system to hold all that soil together. Temperature changes within the crater can go from below freezing to up to 80 degrees in less than 24 hours, and sometimes gusts can reach 50 mph or more. Every so often, when there is a big rainstorm up there, all that water will carve out that loose sediment down into the crater. All of these factors have contributed to an extremely fast rate of erosion.