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The upper mantle extends to a depth found to be much more common than
eclogitic inclusions of 400 kilometres ( 250 miles ) and is characterized by re- -
strong indication that the upper mantle sampled by the The three gional
differences in ...
island arc or continental margin basalt transforms to eclogite oceanic crust folded
oceanic sediments sediments trench residual peridotite bodies sink back into
mantle midocean ridge alkali basalt volcanoes basalt magma andesitic volcano ...
The two major discontinuities that are universally recognized are the Mohorovičić
Discontinuity , which divides the Earth's crust from its underlying mantle , and the
Wiechert - Gutenberg Discontinuity , which separates the mantle from the core .
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This is the 198215th Edition, in two halves, with the Macropaedia and the Micropaedia. First published in 1768, the publisher is the oldest English-language encyclopedia still in print. Two Scottish ... Read full review