Read the sentence below and answer the question that follows. Richard decided to spend his vacation backpacking to see how far from sea level he could make it. The term underlined in the sentence above can best be described as __________.

The underlined term is “sea level.” Sea level is used as a reference point for measuring elevation, such as how high a mountain or location is above the ocean. Therefore, choice A, “a reference point for measuring elevation,” is correct.

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