This chapter contains the following boxed readings:Earth Systems
Box 19.3: Drilling Through Ice Sheets for a Record of the Past
Box 19.5: Causes of Glacial AgesEnvironmental Geology
Box 19.1: Glaciers as a Water Resource
Box 19.2: Water Beneath Glaciers: Floods, Giant Lakes, and Galloping GlaciersIn Greater Depth
Box 19.6: The Channeled ScablandsPlanetary Geology
Box 19.4: Mars on a Glacier
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