Word: undercutting
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...glacier. The model of the torrent illustrates the early stages of valley growth, when the little head water branch streams are gnawing backwards with great rapidity into the plateau country above them. Landslides are thus produced, several of them being indicated both in the incipient stages of undercut and semi-detached masses, and later their catas trophic fall. The detritus carried by the torrent is opened out in a broad fan-delta of gentle declivity across the bottom of a wider valley of greater age: and the river of this valley is thereby pushed against the further slope, where...