Discussion
Glaciers always melt first at the
Answer: C
The key's answer is the bottom.
The textbook reason is pressure: the weight of the ice above presses on the base of a glacier, and higher pressure lowers the melting point of ice. Heat from the ground below and friction from the moving ice add to it, so melting starts at the bed, and the meltwater lubricates the glacier's slide.
The top surface, sides and middle are under less pressure and so have a higher melting point, which is why the key rules them out.
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