£'* FIGURĘ 17-9 Flow velocity in a valley glacifcr vari«s borh hońzonially and vertically. Vcloaty is grcatest at thc top-cen ter oł rhc glader Fricrion with rhe walls and floor of the glacial irouizli caubcb thc flow tu bc blowci adiacent lo ihese boundaries.
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The lengtfi of the arrows in tlicr figurę is proporlional Lo ihe vdocity.