Magma cools and crystallizes to form igneous rock. Igneous rock undergoes weathering (or breakdown) to formsediment. ... As the sedimentary rock is buried under more and more sediment, the heat and pressure of burial cause metamorphism to occur. This transforms the sedimentary rock into a metamo...
A. magma rises up along the divergent boundary B. there is a lot of sediment accumulation C. the continental plates push the oceanic plates D. the water pressure is low in that area 相关知识点: 试题来源: 解析 A。解析:洋中脊附近火山岛的形成主要是因为岩浆沿着板块的离散边界上升。选项B,...
Where is seafloor sediment thickest?Sediment:Sediment is defined as solid material or particles that are deposited at the bottom of a liquid environment or a solution. Some examples of sediments include gravel, mud or even sand. Sediment is able to displace due to the process of erosion....
A strong zonation of clinopyroxene and kaersutite phenocrysts implies mixing processes in the magma system although the liquid compositions do not lie on mixing trends. A geochemical study of the bulk ashes shows that some ash layers possess distinct chemical compositions. The ashes are more ...
Where does basaltic magma form? Who discovered the boundary between the Earth's crust and mantle? How are ocean trenches formed by tectonic plates? Where does siltstone form in sediment stratigraphy? Is oceanic lithosphere recycled to the subduction zone?
If we assume that the lithology was a near-surface fine-grained quartz-rich sediment, it is highly unlikely that minitnhoertgeakstistpe emcieelst,oytiheeldritnhgatnoHth2Oe hwigehreVpNreDse(n>t 1i0n3smufmfic3i)eanntdcolonwcepnotrraotsiiotny to explain the extensive (4.7–4.9...
A volcano is the forcible ejection of the hot molten rock materials and gases found beneath the surface of the earth. The molten material is the magma, and once it reaches the surface, it loses its heat and gases, solidifies, and forms lava. ...
Is Lahar a composite volcano? Composite volcanoes are normally associated with subduction, and while their magma tends to be intermediate on average, it can range all the way from felsic to mafic. ... Lahars, volcano-relatedmudflows, can be large enough to destroy entire towns. ...
Granite formed bytwo different processes:by fractional crystallization of basaltic magma; and by melting older continental crust. Between these end members, there is a spectrum of hybrid processes, including mixing of basaltic and granitic magmas, and contamination of basaltic magma by partial melts of...
If we assume that the lithology was a near-surface fine-grained quartz-rich sediment, it is highly unlikely that minitnhoertgeakstistpe emcieelst,oytiheeldritnhgatnoHth2Oe hwigehreVpNreDse(n>t 1i0n3smufmfic3i)eanntdcolonwcepnotrraotsiiotny to explain the extensive (4.7–4.9...