Scientists had found an intriguing dome on the seafloor, called the Atlantis Massif (right), made of peridotite, a rock usually found deep in Earth's mantle layer
This is the mantle layer
, where temperatures can reach more than 1,371 [degrees] c, hot enough to melt rock that can extend down to more than 3,200 kilometers.
Inner mantle layer
parenchymatous, cells colorless to light yellowish, cells irregular in shape, no matrix material observed, cells 13-15 um in length, 11-14 um in width (Fig.
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
Geophysicists estimate that some 80 percent of its heat comes from the decay of radioactive elements distributed throughout the mantle layer