What determines how quickly a glacier moves?

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    The position of a glacier has the largest influence on its movement. A larger volume of ice placed on a steeper slope on which it sits will cause the glacier to move faster. It also has to do with the amount of the glacier that melts. This is what causes the actual movement. Glaciers in more temperate environments tend to move more because they are melting faster, causing more lubrication for the glacier to shift. The weight and size of the glacier as well as the roughness of the rock surface affect the speed and movement of the ice also. 

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