(Q003) Identify the true statement.Group of answer choicesParts of a glacier all move at the same rate.Polar glaciers move along a wet cushion of liquid at their base.Continental glaciers spread across the landscape laterally in response to their own weight.The uppermost layer of ice in a glacier moves by plastic deformation; the base, by brittle deformation.
Question
(Q003) Identify the true statement.Group of answer choicesParts of a glacier all move at the same rate.Polar glaciers move along a wet cushion of liquid at their base.Continental glaciers spread across the landscape laterally in response to their own weight.The uppermost layer of ice in a glacier moves by plastic deformation; the base, by brittle deformation.
Solution
The true statement is: "Continental glaciers spread across the landscape laterally in response to their own weight."
This is because continental glaciers, also known as ice sheets, are massive areas of ice that cover land and spread out under their own weight. This spreading is due to the immense pressure exerted by the overlying ice, which causes the ice to deform and flow.
The other statements are not entirely accurate. While parts of a glacier can move at different rates due to variations in terrain and temperature, it's not true that all parts move at the same rate. Polar glaciers do not move along a wet cushion of liquid at their base; instead, they are frozen to the underlying rock. And while it's true that the upper layers of a glacier can deform plastically, the base of a glacier does not move by brittle deformation. Instead, it can slide over the bedrock or deform plastically like the layers above.
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