Question at position 40 What is glacial calving? A glacier breaking up or splintering so as to produce a detached piece.A glacier thinning by melting down.A glacier expanding, producing more ice coverage.

Question

BlackTom AI · Accepted Answer

Question restatement: What is glacial calving?

Option 1: A glacier breaking up or splintering so as to produce a detached piece.
This describes the process of calving, where chunks of ice break off at the terminus of a glacier, forming icebergs in a body of water or leaving a cliffed terminus. It aligns with the standard definition of calving in glaciology.

Option 2: A glacier thinning by melting down.
This describes ablation or melt-related thinning of the glacier surface, not calving. While thinning can occur alongside calving, it is a different process that reduces ice volume through melting rather than the mechanical breakup of ice at the terminus.

Option 3: A glacier expanding, producing more ice coverage.
This describes forward growth or advance of a glacier, which increases ice area or thickness but is not calving. Calving is about fragments breaking off, not about expansion.

Reasoning about potential misconceptions:
- Some learners might confuse calving with simple melting; remember calving is a mechanical process of piece detachment, typically at the terminus, often producing icebergs.
- Another common confusion is between calving and glacier advance. Calving does not imply expansion; it may occur in a retreating glacier where pieces break off as the terminus recedes.
- The term 'detached piece' in the description is a key cue pointing to calving, distinguishing it from thinning due to melt or growth due to accumulation.

Summary of correctness:
- The statement that matches the standard definition of glacial calving is the one describing the glacier breaking up or splintering to produce a detached piece, while the other options describe related but distinct glacier processes (melting-induced thinning and glacier expansion).

Question at position 40 What is glacial calving? A glacier breaking up or splintering so as to produce a detached piece.A glacier thinning by melting down.A glacier expanding, producing more ice coverage.单项选择题

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