How did the ancestral puebloans adapt their housing to the building materials that were available in the arid southwest

The arid southwest where the ancestral puebloans existed comprised of southeastern Utah, northeastern Arizona, northwestern New Mexico and southwestern Colorado. Their knowledge of celestial sciences contributed to them adapting their housing to building materials available, like constructing small family grass-thatched pit houses and cliff-sited dwellings for defence. Some of them included grass and stone.