The margins of glaciers are usually darker than the interior primarily because

Name: The margins of glaciers are usually darker than the interior primarily because
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The darker margins of glaciers are usually due to a higher concentration of rocks and debris which can make the ice appear darker in color. The other options (shearing causing expelling air, transparency allowing bedrock to be seen, and faster movement of sides) do not account for the consistent darkness seen along the margins of glaciers.

The Margins of Glaciers Are Usually Darker Than the Interior