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Physicists took two atomic clocks, placed one at sea level and the other on top of Mount Sunapee. After four days the clock on the mountain top was 4 nanoseconds ahead of the clock at sea level. They said that since the clock was further from the center of the earth, it moved faster, because their was less gravity. My question is...what about the mass of the mountain? It's farther away from the center sure, but there is more earth between it and the clock at sea level. Please explain.