Why did the Anasazi use clay or stone to build their homes?

The Native Americans of the southwest built homes out of dried clay brick instead of wood and bark because the dried clays were their Natural Resources. The southwestern region was mostly dry, which is why it was treeless. The Native Americans had to adapt to their surroundings, and so far the dried clays were the best resources to use when building homes. If they had wood and bark around them, they would've definitely used them to make homes like the Iroquois built the longhouses. However, their climate was different from the northeastern regions, so they built adobe buildings or pueblos to live in.