High Sierra granite overlooking a snow melt lake. Glaciers moved across this 20,000 years ago, grinding and scarring the surface. You can tell the direction the glacier was moving by the direction of the scratches. A glacier usually has to reach a massive 60-feet thick before it moves.
From the National Snow and Ice Data Center: "Glaciers are made up of fallen snow that, over many years, compresses into large, thickened ice masses. Glaciers form when snow remains in one location long enough to transform into ice. What makes glaciers unique is their ability to move. Due to sheer mass, glaciers flow like very slow rivers. Some glaciers are as small as football fields, while others grow to be dozens or even hundreds of kilometers long."
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