11.   At dusk, Mangelsdorf said she could hear the sound of a big rapid booming off the canyon walls just downstream.

12.   At one moment, you are standing atop a sandy ridge, watching hawks soaring on the updrafts curling up the canyon walls.

13.   At points the canyon walls are so narrow the walker almost can touch both sides.

14.   At the Rock Slide, huge rocks have peeled away from the towering canyon wall and fallen into the canyon gorge.

15.   Behind the canyon wall, the fire was coming.

16.   - Nearly enough water seeps into the canyon walls or is evaporated into the air to serve the entire Phoenix metropolitan area.

17.   A silent flash of lightning bleaches the canyon walls for a millisecond.

18.   Above the volcanic basalt canyon walls, an osprey was also out at first light, hoping for a fish.

19.   Adams turned his attention away from the vegetation and to the canyon wall itself, where a rusty-looking brown belt separates two layers of rock.

20.   But a stomach crawl through a slit in the canyon wall provides entry and offers an illuminating glimpse into the world of the holy warrior.