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What causes the upper part of a glacier to move? Group of answer choices The upper ice melts faster than the lower ice, causing it
What causes the upper part of a glacier to move? Group of answer choices The upper ice melts faster than the lower ice, causing it to slide. The stress levels at the surface are higher than at depth. The upper ice deforms and flows due to its own weight. The lower ice flows, carrying the upper rigid ice along with it
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