Which one of the following statements concerning glaciers is not true? group of answer choices ice sheets are larger than ice caps. piedmont glaciers form on lowlands at the base of mountainous terrain. the volume of water tied up in the antarctic ice sheet is about the same as the total discharge of the amazon river in one year. long, extended, alpine glaciers occupied valleys in most high, mountainous areas in the united states, canada, and europe at one or more times during the past two million years.