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Oceanic Crust
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Details
Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Oceanic crust is the part of Earth''s lithosphere that surfaces in the ocean basins. Oceanic crust is primarily composed of mafic rocks, or sima, which is rich in iron and magnesium. It is thinner than continental crust, or sial, generally less than 10 kilometers thick, however it is denser, having a mean density of about 3.3 grams per cubic centimeter. Although a complete section of oceanic crust has not yet been drilled, geologists have several pieces of evidence that help them understand the ocean floor. Estimations of composition are based on analyses of ophiolites (sections of oceanic crust that are preserved on the continents), comparisons of the seismic structure of the oceanic crust with laboratory determinations of seismic velocities in known rock types, and samples recovered from the ocean floor by submersibles, dredging (especially from ridge crests and fracture zones) and drilling.
Weitere Informationen
- Allgemeine Informationen
- GTIN 09786130987039
- Editor Lambert M. Surhone, Miriam T. Timpledon, Susan F. Marseken
- Genre Geowissenschaften
- Anzahl Seiten 120
- Größe H220mm x B220mm
- EAN 9786130987039
- Format Fachbuch
- Titel Oceanic Crust
- Herausgeber Betascript Publishing
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