<P> A hanging valley is a tributary valley that is higher than the main valley . They are most commonly associated with U-shaped valleys when a tributary glacier flows into a glacier of larger volume . The main glacier erodes a deep U-shaped valley with nearly vertical sides while the tributary glacier , with a smaller volume of ice , makes a shallower U-shaped valley . Since the surfaces of the glaciers were originally at the same elevation , the shallower valley appears to be ' hanging ' above the main valley . Often , waterfalls form at or near the outlet of the upper valley . </P>
<P> A hanging valley is a tributary valley that is higher than the main valley . They are most commonly associated with U-shaped valleys when a tributary glacier flows into a glacier of larger volume . The main glacier erodes a deep U-shaped valley with nearly vertical sides while the tributary glacier , with a smaller volume of ice , makes a shallower U-shaped valley . Since the surfaces of the glaciers were originally at the same elevation , the shallower valley appears to be ' hanging ' above the main valley . Often , waterfalls form at or near the outlet of the upper valley . </P>
name the agent of erosion that produce hanging valley
name the agent of erosion that produce hanging valley
glacier
glacier