The New Encyclopaedia Britannica: A - K.Encyclopaedia Britannica, 1997 |
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Page 939
... mantle , and the Wiechert - Gutenberg Discontinuity , which separates the mantle from the core . The latter discontinuity exists at a depth of 2,900 kilometres ( 1,800 miles ) ; it is marked by a sudden increase in density , from about ...
... mantle , and the Wiechert - Gutenberg Discontinuity , which separates the mantle from the core . The latter discontinuity exists at a depth of 2,900 kilometres ( 1,800 miles ) ; it is marked by a sudden increase in density , from about ...
Page 940
... mantle , however , the same difficulty as with the core arises : direct sampling is not feasible . Much more geophysical data are available for the mantle , however , and some volcanic eruptions have brought rock fragments to the ...
... mantle , however , the same difficulty as with the core arises : direct sampling is not feasible . Much more geophysical data are available for the mantle , however , and some volcanic eruptions have brought rock fragments to the ...
Page 950
... mantle , bringing with it additional material and energy in the form of heat . The surface hydrosphere The geochemical cycle provides a useful conceptual framework for considering the course followed by an indi- vidual element in ...
... mantle , bringing with it additional material and energy in the form of heat . The surface hydrosphere The geochemical cycle provides a useful conceptual framework for considering the course followed by an indi- vidual element in ...
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