Which of the following statements is correct?
a. ____ All of North America was ice-covered during the Pleistocene; b. ____ Continental glaciers are long, narrow tongues of ice in valleys; c. ____ A moraine is a well-sorted deposit of silt and clay; d. ____ Pollen analysis is helpful in determining ancient climates; e. ____ Oxygen isotope ratios are used to determine the thickness of glaciers.
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