Glaciers are formed by the repeated snowfalls in winter, and snow melts in summer. When snow accumulates by each passing snow fall, the snow becomes ice and heavy. This causes the mass of ice+snow to move around shaping and corroding the rocks. For this reason the mountains surrounding the glaciers will have very unique shapes, steep drop off points and can have sharp edges. Sad thing though, as temperature increases by global warming, the snow gets time to melt away and glaciers will slowly disappear. I read that, glacier national park had so many glaciers,which now dont even exist.
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