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Mantle convection is the very slow creeping motion of Earth’s solid silicate mantle caused by convection currents carrying heat from the interior to the planet’s surface. The Earth’s surface lithosphere rides atop the asthenosphere and the two form the components of the upper mantle.Click to see full answer. Accordingly, why does part of the mantle appear to flow?Many geologists believe that the mantle “flows” because of convection currents. Convection currents are caused by the very hot material at the deepest part of the mantle rising, then cooling, sinking again and then heating, rising and repeating the cycle over and over.Beside above, how does the mantle affect Earth’s crust? Mantle convection describes the movement of the mantle as it transfers heat from the white-hot core to the brittle lithosphere. Convection currents also transfer denser, cooler material from the crust to Earth’s interior through the process of subduction. Correspondingly, does the mantle flow quickly or slowly? s, that of mantle material varies between 1018 and 1021 Pa. s. This level of viscosity means that the mantle moves at a speed of several centimeters per year. It is on a microscopic scale inside mantle material that the Earth’s major deformations are played out.Is the mantle solid or liquid?The Earth’s mantle is a layer of silicate rock between the crust and the outer core. Its mass of 4.01 × 1024 kg is 67% the mass of the Earth. It has a thickness of 2,900 kilometres (1,800 mi) making up about 84% of Earth’s volume. It is predominantly solid but in geological time it behaves as a viscous fluid.

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