File:The top of the continent; the story of a cheerful journey through our national parks (1917) (14784555832).jpg

Identifier: topofcontinentst00yard (find matches)
Title: The top of the continent; the story of a cheerful journey through our national parks
Year: 1917 (1910s)
Authors: Yard, Robert Sterling, 1861-1945
Subjects: National parks and reserves
Publisher: New York, Chicago (etc.) C. Scribner's sons
Contributing Library: The Library of Congress
Digitizing Sponsor: Sloan Foundation

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ear here. They are not so very rapid, though, forthe fastest of these glaciers only moves a foot or morea day. **What makes the crevasses? asked Jack. **Therearent any crevasses in rivers of water. Yes, there are, said Uncle Tom. The ripples inthe rapids in a stream of water correspond to thecrevasses in a glacier. You know that the deep chan-nel of a stream of water moves faster than the shallowedges, dont you? Oh, yes, said Jack. That is always so. And it is so in glaciers, said Uncle Tom. Andthat difference in speed helps make the crevassesdeep and gaping. The ice is pushed fast in the deepmiddle and held back on the shallow sides. Thathelps to tear open the crevasses. Margaret was intensely interested. Is there any other way that a glacier is like ariver? she asked. In almost every way, said Uncle Tom, becausea glacier is a river—an ice-river. Now, you have seenrivers or creeks carry down logs and floating branchesand heap them up on the banks where they turncorners, havent you?
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Pliolograph by Curtis and Miller Looking down into a crevasseThe ice in the Stevens Glacier is probably a thousand feet thick at this point 126 THE TOP OF THE CONTINENT Margaret nodded, her eyes shining. And you have seen rivers and creeks wash outdeep channels and ravines in some spots and heap thesand up on the banks in other spots? Both children assented. Well, glaciers do the same thing. They tearenormous masses of rock loose from some parts oftheir courses and heap them up in other parts. Theywear out deep channels in the softer rock and pile upthe material in the valleys. That is the way the pre-historic glaciers built up those immense moraines thatwe saw in the Rocky Mountain National Park. If theNisqually and these other great living glaciers hereshould ever disappear like those in the Rocky Moun-tain National Park, they would leave behind them thesame kind of enormous moraines. Of course heedless Jack got into difficulties andcaused a sensation. It was the day they spent onth

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