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oceanic crust |
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oceanic crust [‚ō·shē′an·ik ′krəst] (geology) A thick mass of igneous rock which lies under the ocean floor. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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| Traditionally, scientists have envisioned most of the under ocean crust as a layer cake of three rock types. 188]Os ratios over time, which should identify recycled ocean crust in the mantle. The apparent chronology of this picket fence of volcanoes and seamounts, along with evidence culled from the chemistry of their respective lavas, led some scientists decades ago to speculate that the islands were formed as the ocean crust supporting them inched northwest over an abnormally hot spot in Earth's mantle. |
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