"They go across the bridges one at a time usually-- a snow bridge can between 2 feet or 15 feet wide, " he said.
22.
The snow bridges give the illusion of solid ground, but they're really unstable platforms through which one can plunge to death or serious injury.
23.
To say simply that there was a snow bridge would not have done much, " said Wood's former girlfriend, New York Times reporter Somini Sengupta.
24.
Cook's Grand Plateau on New Zealand's South Island when a snow bridge collapsed and he fell eight meters ( 26 feet ) into a crevasse.
25.
"Those snow bridges ( spanning crevasses ) were made in the last storm on Sunday, so the snow's not consolidated, " he warned four climbers.
26.
Snow fences are built vertically and accumulate snow on their downwind side, while snow bridges are slanted or horizontal and hold snow on their top side.
27.
Conditions on the final day on the glacier allowed them to ski, although it was through deep snow on " snow bridges " that cross crevasses.
28.
And on some of the heavily traveled snow bridges, " there are a lot of footsteps across, so that'll give people a false sense of security ."
29.
The sun melts ice holding unstable rock in place, triggering rockfall by early afternoon, and softens or collapses snow bridges on which climbers might cross deep crevasses.
30.
Given the degree of crevassing at the margins, traversing the glacier can be dangerous, particularly in late spring or early summer when snow bridges may be weak.
