The New Encyclopędia BritannicaEncyclopędia Britannica, 1983 - Encyclopedias and dictionaries |
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Page 120
... rocks ( those rich in iron and magnesium ) that have risen from the Earth's mantle . The basaltic layer is 15 to 40 ... rocks of different mineral composition and origin . Some rocks are of magmatic origin and were formed by the cooling ...
... rocks ( those rich in iron and magnesium ) that have risen from the Earth's mantle . The basaltic layer is 15 to 40 ... rocks of different mineral composition and origin . Some rocks are of magmatic origin and were formed by the cooling ...
Page 497
... rocks are derived from pre - existing matter in some form , igneous rocks , those crystallizing from silicate melts , are the closest approximation to primordial earth material . Thus , an examination of the rock cyclethe idealized path ...
... rocks are derived from pre - existing matter in some form , igneous rocks , those crystallizing from silicate melts , are the closest approximation to primordial earth material . Thus , an examination of the rock cyclethe idealized path ...
Page 505
... rock time of sedimentation repeat of the second remark under igneous rock ; those sediment grains derived without alteration from igneous or metamorphic rocks date the time of crystallization or metamorphism , not the time of ...
... rock time of sedimentation repeat of the second remark under igneous rock ; those sediment grains derived without alteration from igneous or metamorphic rocks date the time of crystallization or metamorphism , not the time of ...
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