Convection currents in Earth's mantle are caused by the rise of hot material rising towards the crust, becoming cooler and sinking back down. This process occurs repeatedly, causing the currents to constantly flow. The movement of the currents plays a factor in the movement of the mantle.Know More
The convection currents also help transfer heat from Earth's core, where magma is created through radioactive decay, to the mantle. This heat transfer continues through the layers of the crust until it reaches the surface. The convection currents, as they carry heat upward with the magma, break apart the plates at areas referred to as divergent plate boundaries.
The plates spread at the breaking point, but this pushes the edges of the ocean plates down into the trenches or subduction zones where it is reclaimed or recycled back into the asthenosphere. This occurs because the crust is broken up into multiple tectonic plates. The plates grow when the convection currents cause the spreads, but the spread forces the edges of the plates down into the subduction zones where it is melted once more and turned back into magma. This process keeps the crust in a constant state of movement, which in turn causes Earth's crust to essentially float on the currents of magma below the surface.Learn more about Layers of the Earth
The uneven heating of the Earth's surface is caused by the sun. This occurs because the Earth is a tilted sphere and the sun does not heat all its surfaces equally and because the sun's heat penetrates land and water at different rates.Full Answer >
Convection currents move tectonic plates when there is heat inside the mantle that is rising and falling. The radioactive decay in the core is responsible for the convection currents.Full Answer >
Mantle conviction is the process in which heat is transferred from the Earth's core to its surface; heat is released from the core and rises, causing temperature fluctuation where the excess temperature from the hot magma is transferred to the colder areas above it and eventually to the Earth's surface. An everyday example of this process is boiling water; hot water from the bottom of the pot rises to transfer energy to the cooler water at the top, which sinks to the bottom.Full Answer >
Magma rises from the mantle because it is more buoyant than the surrounding rocks. This occurs when gas dissolved in the magma forms bubbles, reducing its density and causing it to well upward. If the magma finds a vent, or the pressure cracks the crust, it can reach the surface.Full Answer >