Glaciers are giant blocks of snow and ice that form over thousands of years in areas that receive snowfall year-round. As layers of snow accumulate and melt, the melted snow refreezes into layers of ice that build up and compress to form glaciers. Glaciers can be found on every continent except Australia, usually in polar or mountainous regions, and they move slowly due to the force of gravity pulling on melted ice at their edges.

1. By: A.I.R.

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