Volcanoes

4. When to expense something and when to capitalize it. Not all expenses are created equal. 5. What individual items on the statements, like Goodwill, Other Intangibles and Shareholders' Equity, actually mean. The questions below will cover all these concepts.The basaltic magma produced rises through continental crust rich in silica, resulting in the intermediate andesitic product. When magma approaches the surface of the Earth, however, that pressure decreases, and gases can then come out of solution.Magma cools because the crust is cooler than the magma, and magma decompresses as it rises. Some volcanism can also occur where continental crust rifts and mantle upwells and melts, such as in the The other main mechanism for producing magma is related to subduction of tectonic plates.subduction zones continent/continent convergence spreading centers transform boundaries. If the Atlantic Ocean is widening at a rate of 3 cm per year how far (in kilometers) will it spread in a million years?When thick magma and large amounts of gas build up under the surface, eruptions can be explosive, expelling lava, rocks and ash into the air. This can happen over a period of weeks or many millions of years.

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what generally happens when subduction-derived magma encounters thick continental crust. B) the magma solidifies in sheeted dikes with a composition of basalt. a hot spot is interpreted to have formed from. C) abundant magma formed within a typical mid-ocean ridge. this volcano is relatively...Ocean-Continent Convergence. When oceanic crust converges with continental crust, the denser oceanic plate If the magma at a continental arc is felsic, it may be too viscous (thick) to rise through the crust. Subduction is sometimes called crustal recycling. Why do you think this is the case?Transfer of Heat- When magmas that were generated by some other mechanism intrude into cold crust, they bring with them heat. But, processes that operate during transportation toward the surface or during storage in the crust can alter the chemical composition of the magma.The relative contributions of the subduction and lithosphere components to the composition of active continental margin basalts can be In a typical basalt, from Central Chile, the subduction zone can be shown to make the dominant contribution to its mantle-derived magmas by Archaean sial, Contr.

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The modeling results reveal the continental crust stress is dominated by horizontal compression during the early stage of the subduction, which could revert to a horizontal extension in the back-arc region, combing with the roll-back of the subducting slab and development of mantle upwelling.Subduction is a geological process that takes place at convergent boundaries of tectonic plates where one plate What happens when two oceanic plates collide? At some convergent boundaries, an oceanic plate collides Oceanic crust tends to be denser and thinner than continental crust, so the...C) Subduction brings one plate to a depth hot enough for minerals to release water this water causes melting in the overlying asthenosphere. 69) Which layer in the earth is similar to the composition of granite?1. Introduction When two continental plates converge, smooth subduction is hard to operate, and He attributed the subductability of the continental crust beneath Hidu Kush to the eclogitization of the We will propose in this paper that this could happen because the Indian lithosphere had passed...72. What generally happens when subduction-derived magma encounters thick continental crust? A. most magma reaches the surface with minor modificationB. the magma solidifies in sheeted dikes with a composition of basaltC.the magma interacts with the crust, forming felsic or...

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