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Q1: The Mercator projection should not be used
Q17: Currently, the valley floor of Death Valley
Q45: When hot water is ejected from a
Q48: The solubility of carbon dioxide _ as
Q53: A remnant of a previous valley floor
Q54: When a first-order stream joins a second-order
Q71: How many continental ice sheets are in
Q83: Knickpoints are irregularities in otherwise graded channel
Q135: Soil creep is unimportant in arid regions
Q152: _ is an area of extensive flood