Page 571 Look again at the photograph of the Barnard Glacier in Alaska at the be
ID: 294065 • Letter: P
Question
Page 571
Look again at the photograph of the Barnard Glacier in Alaska at the beginning of the chapter (p. 540). What are the “stripes” running down the middle of the glacier? What happens to the lateral moraines of tributaries when they join the main glacier? What do you see that suggests that some of the tributary glaciers have tributaries themselves farther up-valley? If the glacier were to recede significantly, leaving an empty glacial valley, what features would be left by the tributary glaciers?
Explanation / Answer
As the tributaries glacier join together the moraines or the debris comes together at the intersection point where they meet and continue to follow the down slope resulting in the development of medial moraine, these moraines are sometimes found in the groups indicating that the several glaciers have joined together to form an candy-cane effect of black and white band towards the slope towards the valley.
When the glacier were to be melted out the subsurface topography will come to the exposure, the valleys of different depth will be visible, small tributary would not erode to the deepest level. The mouth of the tributaries will lead to the development of the hanging valley, as the ice melts ti’s being occupied the floor of the tributary valleys and it will find its way to the main trough.
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