Continental and oceanic crust on the upper mantle. Continental crust is the layer of igneous, metamorphic, and sedimentary rocks that forms the geological continents and the areas of shallow seabed close to their shores, known as continental shelves.This layer is sometimes called sial because its bulk composition is richer in aluminium silicates (Al-Si) and has a lower density compared to the.. oceanic crust, the outermost layer of Earth's lithosphere that is found under the oceans and formed at spreading centres on oceanic ridges, which occur at divergent plate boundaries. Oceanic crust is about 6 km (4 miles) thick. It is composed of several layers, not including the overlying sediment. The topmost layer, about 500 metres (1,650.
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Differences in Range and Thickness. Oceanic plates cover approximately 71 percent of Earth's surface, while continental plates cover 29 percent. While oceanic plates cover far more area, they are much thinner than continental crust. Despite their greater density, oceanic plates average only about four or five miles in thickness, compared to.. Summary: 1.The oceanic crust is made up of basalt while the continental crust is made up of granite. 2.The oceanic crust is thinner while the continental crust is much thicker. 3.The oceanic crust is denser than the continental crust. 4.The continental crust has greater buoyancy than the oceanic crust.
