This geography problem is solved step by step below, with detailed explanations to help you understand the method and arrive at the correct answer.
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Step 1: Snow Accumulation. It begins with snowfall in areas where temperatures are low enough for snow to persist year-round. Over time, more snow falls than melts, leading to a buildup.
Step 2: Compaction and Granulation. The weight of the accumulating snow compresses the lower layers. This pressure causes the snowflakes to lose their delicate, feathery structure and become smaller, denser, rounded ice grains called firn.
Step 3: Recrystallization and Ice Formation. As more snow and firn accumulate, the pressure increases further. The firn grains begin to melt slightly at their contact points and then refreeze, fusing together. This process, called recrystallization, transforms the firn into solid, dense glacial ice.
Step 4: Movement. Once the ice becomes thick enough (typically tens of meters), the immense pressure causes it to deform and begin flowing downhill or outward under its own weight, forming a glacier.
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Snow Accumulation. It begins with snowfall in areas where temperatures are low enough for snow to persist year-round.
This geography problem is solved step by step below, with detailed explanations to help you understand the method and arrive at the correct answer.