How Does A Glacier Move?
Answer:
Glaciers are not a rarity today. The most common type is called 'valley glaciers'. In the Alps alone there are more than 1200 vale glaciers and in the high mountains of southern Alaska there are tens of thousands of them.
Valley glaciers creep downward similar to great rivers of ice from snowy mountains. The source of the large quantities of snow that form most gorge glaciers is a valley head that is shaped close to an amphitheatre with steep walls. Snow is blown into this area or slides down in avalanches. It does not thaw out during the summer but gets deeper year by year.
Eventually, the increasing pressure from above, together with some melting and refreezing, forces the atmosphere out of the lower part of the mass and changes it to solid ice. Further pressure from the cargo of ice and snow above eventually squeezes this mass of ice until it begins to creep slowly out of the pudding basin and down the valley.
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