Glaciers can act erratically; for many years, a glacier may move only a few yards/year, then for a few years it may suddenly surge forward at several hundreds to thousands of feet/year, before slowing again.

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This statement is true. Glaciers can experience periods of slow movement, followed by sudden surges of faster movement before returning to slower speeds. These erratic movements can be influenced by factors such as changes in temperature, precipitation, or the slope and shape of the glacier itself.

Glaciers Can Act Erratically; for Many Years, a Glacier May