| 单词 | oceanic crust |
| 释义 | > as lemmasoceanic crust oceanic crust n. Geology the crust underlying the earth's ocean basins, now known to consist of a layered system of dense basalts and gabbros, of relatively uniform thickness and often covered with a thinner sedimentary layer, and lacking the deep granitic layer characteristic of continental crust. ΘΚΠ the world > the earth > structure of the earth > [noun] > crust > parts of crust oceanic crust1863 platform1880 sal1909 sima1909 sial1922 ocean crust1927 1863Oceanic crust [see sense 1c]. 1928 W. A. J. M. van W. van der Gracht in Theory Continental Drift 56 The oceanic crust becomes..relatively more resistant than the one under the continents. 1944 A. Holmes Princ. Physical Geol. xvii. 373 Most of the oceanic crust seems to be like that of the deeper parts of the basaltic layers beneath the continents. 1984 A. C. Duxbury & A. Duxbury Introd. World's Oceans iii. 75 Continental crust has a density of 2.8 g/cm3 and is approximately 40 km thick, while oceanic crust is only about 7 km thick and has a density of 3.0 g/cm3. 1995 New Scientist 25 Nov. 33/1 The Pacific is..encircled by the ‘ring of fire’—subduction zones where the heavy, dense oceanic crust slides under the lighter more buoyant continental crust. < as lemmas |
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