Correct Response: C. Striations in the bedrock of glaciated regions are linear gouges and scratches in bedrock produced by rocks stuck to the bottom of a cold-based glacier. Glacial ice is capable of eroding rock, but is not strong enough to create long linear gouges (A) in bedrock. Extreme temperature changes can cause mechanical weathering, but do not produce the long linear scratches and gouges that comprise striations (B). Although sub-glacial, sediment-rich water can erode the bedrock beneath a glacier, it does so relatively evenly and does not produce striations (D).
