All glacial ice must melt slightly before it can become denser. Evaluate this statement.
A) This statement is true; especially in Alaska where summers are warm.
B) This statement is true. Glacial ice formed by melting and pressure becomes denser than water.
C) This statement is false. Snow can go through metamorphosis to ice over time without melting.
D) This statement is false. Glacial snow and ice may melt and reform, but they do not get denser.
Question 2
Glaciers have no defined cleavage planes, but instead flow plastically. Evaluate this statement.
A) This statement is true, but it only applies to the upper part of a glacier.
B) This statement is false. Ice has cleavage similar to the mineral mica, and ice behaves like mica would under the same pressure.
C) This statement is partially true. The flow of glaciers is very slow and more similar to gravel than to plastic.
D) This statement is false. Glaciers do flow plastically, but also have well-defined cleavage planes similar to mica.
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