desert landscape with dry brush, cholla and palo verde treesi in mcdowell sonoran preserve

granite rocks metamorphic trail hiking horseshoe loop mcdowell sonoran preserve scottsdale desert landscape geology cholla cactus dead brush nature outdoors arizona usa america mountains saguaro carnegiea gigantea parkinsonia teddybear jumping cylindropuntia tourism travel vacation scenic harsh environment ecosystem sight fire hazard palo verde trees homes dry treesi