the thickness of upper mantle is?
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About 640 Km
- The thickness of the upper mantle is about 640 km (400 mi). The entire mantle is about 2,900 km (1,800 mi) thick, which means the upper mantle is only about 20% of the total mantle thickness.
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The thickness of the upper mantle is about 640 km (400 mi). The entire mantle is about 2,900 km (1,800 mi).
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