B. The earth's mantle is a region of slow but constant activity as the solid rock of the mantle dissipates heat from the core by convective movement. How can you explain the observation that compared to the image at 100 km depth, the anomalies at 2880 km. are more subdued at this greater depth within the earth? How can you explain the apparent shift in position of the warmer and cooler zones at this greater depth compared to the tomograph at the shallower depth?
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