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Geophysicists estimate that some 80 percent of its heat comes from the decay of radioactive elements distributed throughout the mantle layer.
Iceland, the Azores, and the Galapagos are examples of these "hotspot" islands - so named because they are believed to form above small regions scattered around the earth where unusually hot rocks rise from deep inside the mantle layer.
Dual Mantle Both the inner and outer mantles are comprised of ionomer blends in different ratios to affect the hardness and resilience of each mantle layer.