The New Encyclopædia Britannica, Volume 16Encyclopaedia Britannica, 1981 - Encyclopedias and dictionaries |
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Page 113
... asthenosphere , a solid layer close to the melting point and having no ef- 500 1500 3000 mi 0 0 Scale is true only on the Equator 1500 3000 4500 km AMERICAN 0 ° PACIFIC LA ANTARCTIC Equator AMERICAN EURASIAN INDIAN 1000 ANTARCTIC ...
... asthenosphere , a solid layer close to the melting point and having no ef- 500 1500 3000 mi 0 0 Scale is true only on the Equator 1500 3000 4500 km AMERICAN 0 ° PACIFIC LA ANTARCTIC Equator AMERICAN EURASIAN INDIAN 1000 ANTARCTIC ...
Page 114
... asthenosphere , heated , and mixed with mantle rock to produce silica - enriched hybrid mag- mas . Some petrologists ascribe the andesitic volcanics of the Pacific margin to this process ; others believe andesites are primary ...
... asthenosphere , heated , and mixed with mantle rock to produce silica - enriched hybrid mag- mas . Some petrologists ascribe the andesitic volcanics of the Pacific margin to this process ; others believe andesites are primary ...
Page 123
... asthenosphere and heat flow . There is a correla- tion between the endogenic regimes on the surface and the underlying asthenosphere . Under the more stable sec- tions of the ancient platforms - the crystalline shields— the asthenosphere ...
... asthenosphere and heat flow . There is a correla- tion between the endogenic regimes on the surface and the underlying asthenosphere . Under the more stable sec- tions of the ancient platforms - the crystalline shields— the asthenosphere ...
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