How do glaciers move?

(1) On June 28, 2009 at 1:20 am Gs99 [0] said:

Questions about glacier movement.

1. Is it only due to gravity (moving from top of mountain to the valley, stopping there?

2. Is it a "free-standing" object, not connected at the top?

3. Can a glacier be manufactured, to study the movement?

Thanks

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