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Anasazi Anthropology archaeology Astrogeologic astronomers atmosphere began biologists Biology Department bowl burro Carothers cinder cone clay collections color Colorado Plateau Colorado River Colton Curator decorated desert developed Doney Crater early Earth ecological eruption exhibits fired Flagstaff forest formation geologic geologists Grand Canyon habitats Hopi pottery Indian interest Kaibab Kaibab Limestone land lava flows layers Little Colorado River live Lowell Observatory Mars McDougall ment Mesa miles Moenkopi mountain Museum of Northern National Park Navajo Northern Arizona observations painted Park Service Photograph planetarium planetary plants and animals prehistoric Pueblo region riparian rock ruins San Francisco Peaks scientists Sikyatki Sinagua Southwest species staff stars Sunset Crater surface techniques telescope temperature tion U.S. Naval Observatory University V.M. Slipher vegetation vessel visitors volcanic Ware Wupatki area Wupatki National Wupatki National Monument yellow