Even when a glacier is retreating, the up-valley ice is still moving forward toward the down-valley terminus of the glacier.

Name: Even when a glacier is retreating, the up-valley ice is still moving forward toward the down-valley terminus of the glacier.
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Quizplus · Accepted Answer

This is true. Even if the glacier is retreating overall, the ice in the upper part of the glacier is still flowing towards the lower part where the glacier ends, unless there is a lack of sufficient snow and ice accumulation to maintain its length.

Even When a Glacier Is Retreating, the Up-Valley Ice Is