"by 8: 00am, we had struggled on to the south summit, 28,700 feet. after a short rest, chris took off for the summit, cranking it into "morris gear," and luis took over in front of me. from the south summit, the true summit is still at least two hours away across the three-hundred-foot-long-knife-edge ridge, up the fifty-foot vertical hillary step, and finally traversing up a long slightly broader ridge to the summit." what organizational structure is the author using in this passage from "everest"? chronological order of importance cause-effect compare-contrast