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Slope and temperature play a very important role here, the steeper the slope and the higher the temperature, the easier the glacies flows. That being said, a glacier typically starts to flow when it reaches a thickness of between say 50 and 200 meters, depending on slope and temperature. The speed at which it flows is then several meters per year to several tens of meters per year, again depending on slope and temperature.

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Q: A glacier will begin to flow when it reaches what critical thickness?
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