What is a possible cause for the glacier retreating


Question: What is a possible cause for the glacier retreating? a. Annual snowfall has increased, causing the zone of accumulation to grow. b. The glacier's terminus has broken off to form an iceberg. c. Glacial erosion has worn away the terminus, causing the glacier to retreat. d. Annual snowfall has decreased, leading the glacier's equilibrium altitude line to retreat higher up the slope and causing the whole glacier to retreat.

 

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Science: What is a possible cause for the glacier retreating
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