Thesaurus. The thesaurus of synonyms and related words is fully integrated into the dictionary. Click on the thesaurus category heading under the button in an entry to see the synonyms and related words for that meaning.his is the British English definition of geography. View American English definition of geography.
♦ The crust that lies underneath the oceans is called oceanic crust, and is approximately 3 to 6 miles (4.8 to 9.7 kilometers) thick. It has a similar composition to that of continental crust, but has higher concentrations of iron, magnesium, and calcium. crust-form a crust or form into a crust; The bread crusted in the oven. change surface-undergo or cause to undergo a change in the surface. Oceanic crust is the part of the Earth's crust that makes up the seafloor. It's thinner, denser, and simpler in structure than the continental crust. Oceanic crust is also younger, on average; from its birth at a mid-ocean ridge to its end at a subduction zone is no more than 250 million years. A term that is sometimes used for oceanic crust rocks is sima, which is short for magnesium silicate, a common component of these rocks. Another term for these undersea igneous rocks is mafic, which comes from the fact that they are high in magnesium and iron. Basalt and gabbro are examples of mafic rock Thesaurus. The thesaurus of synonyms and related words is fully integrated into the dictionary. Click on the thesaurus category heading under the button in an entry to see the synonyms and related words for that meaning. This is the British English definition of geography. View American English definition of geography. Change your default dictionary to American English. View the pronunciation for 2. crust, incrustation, encrustation, covering, natural covering, cover. usage: a hard outer layer that covers something. 3. crust, gall, impertinence, impudence, insolence, cheekiness, freshness, discourtesy, rudeness. usage: the trait of being rude and impertinent; inclined to take liberties.  90% of the time, speakers of English use just 7,500 words in speech and writing. These words appear in red, and are graded with stars. One-star words are frequent, two-star words are more frequent, and three-star words are the most frequent. This is the British English definition of geography. View American English definition of geography. Change your default dictionary to American English. View the pronunciation for crust. The solid, outermost layer of the Earth. ♦ The crust that lies underneath the continents is called continental crust, and is approximately 22 to 37 miles (35.4 to 59.6 kilometers) thick. It consists mostly of rocks rich in silica and aluminum, with minor amounts of iron, magnesium, calcium, sodium, and potassium. crust-form a crust or form into a crust; The bread crusted in the oven. change surface-undergo or cause to undergo a change in the surface. 1 In contrast to the continental crust, the oceanic crust is young, thin, and chemically magnesium-rich. 2  Enormous pressures are produced in this region, for the continental crust and the oceanic crust are moving toward each other. 3  The continental slope connects the continental shelf and the oceanic crust. The relatively thin part of the earth’s crust which underlies the ocean basins. It is geologically young compared with the continental crust and consists of basaltic rock overlain by sediments. Example sentences. 1  In contrast to the continental crust, the oceanic crust is young, thin, and chemically magnesium-rich crustal plate, plate-a rigid layer of the Earth's crust that is believed to drift slowly. sial-the granitelike rocks that form the outermost layer of the earth's crust; rich in silicon and aluminum. sima-rock that form the continuous lower layer of the earth's crust; rich in silicon and magnesium. 1  Facebook. Earth's crust-the outer layer of the Earth. crust. layer-a relatively thin sheetlike expanse or region lying over or under another. asthenosphere-the lower layer of the crust. horst-a ridge of the earth's crust that has been forced upward between two faults and so is higher than the surrounding land.
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geography crust definition synonym