Not only has the heart of glen canyon been buried, but many of the side canyons above the fluctuating waterline are now rendered more difficult, not easier, to get into. this because the debris brought down into them by desert storms, no longer carried away by the river, must unavoidably build up in the area where flood meets reservoir. narrow canyon, for example, at the head of the impounded waters, is already beginning to silt up and to amass huge quantities of driftwood, some of it floating on the surface, some of it half afloat beneath the surface. anyone who has tried to pilot a motorboat through a raft of half-sunken logs and bloated dead cows will have his own thoughts on the accessibility of these waters. which rhetorical technique is abbey using in the underlined section of this excerpt? a. ethos b. pathos c. logos d. ad hominem