The topic sentence is a sentence that expresses the main idea of the paragraph in which it occurs.
This paragraph is mainly about; The speaker has a vivid memory of going to the Zugspitze Mountain in Germany, and he learned how the difference in temperature affected the mountain.
The main sentence of this paragraph is "The day we went up the Zugspitze is the day that I learned that there can be a surprising difference in temperature between the ground and the top of a mountain." The sentences after were explaining the temperature differences. The first sentence is just about his memory. The topic sentence is his memory about the Zugspitze Mountain.
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