The difference in density has an impact on isostacy of crust floating on the semi-fluid upper mantle (asthenosphere), withcontinental crust(about 2.7g/cm3) rising or floating aboveoceanic crust(about 3.5 g/cm3).
The crustal structure varies systematically with a small number of parameters such as the age of the lithosphere, the spreading rate at which the crust is formed, its position with respect to offsets in the ridge axis, and the proximity of thermal or chemical perturbations such as mantle ...
Continental crust is older than oceanic crust because the subduction process that destroys the Earth's crust rarely destroys or recycles the...Become a member and unlock all Study Answers Start today. Try it now Create an account Ask a question Our experts can answer your tough homework and...
Learn about the oceanic crust, including the oceanic crust definition, oceanic crust thickness and density, oceanic crust composition, and other...
In general, compared with the oceanic crust, the continental crust is _. A. thinner B. thicker C. of the same thickness D. more liquid 相关知识点: 试题来源: 解析 B。解析:大陆地壳和大洋地壳在厚度上有明显差异。大陆地壳相对较厚,平均厚度约35千米,而大洋地壳较薄,平均厚度约7千米。这是因为...
Trench Island are Oceanic crust Continental crust Lithosphere Lithosphere Asthenosphere板块构造学说是20世纪最重要的科学成果之一,它科学地解释了地震、火山等地壳运动的机理.如图为某种类型的板块边界示意图.回答4-6题.以下地貌单元中,成因与图示机理相关的是( ) A. A. 东非大裂谷 B. B. 日本列岛 C. C....
Oceanic Crust vs. Continental CrustThe oceanic crust is the layer of earth beneath the ocean. It is composed of the upper oceanic crust and the lower oceanic crust, and is the top layer of the lithosphere. The continental crust is a layer of rock about 40 km thick which makes up all ...
Thin oceanic crust is formed by decompression melting of the upper mantle at mid-ocean ridges, but the origin of the thick and buoyant continental crust is enigmatic. Juvenile continental crust may form from magmas erupted above intra-oceanic subduction
Continental crust is less dense because of its composition. Continental crust is made up of felsic material (SiO4)-- mainly granite. The density of continental crust is 2.9 g/cm^3. Oceanic crust, while thinner, is made of mafic materials (Fe, Mg)-- mainly basalt. The density of oceanic...
2) continental crust arc 陆壳型弧 1. Each island arc in the Northwest Pacific island arc system is composed ofcontinental crust arc and oceanic crust arc (except for the Mariana island arc). 西北太平洋岛弧系列中的各岛弧(除马里亚纳岛弧为洋壳型弧外)均由陆壳型弧和洋壳型弧组成,并且左端与...