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 >
The four layers of the Earth are called the inner core, the outer core, the mantle and the crust. In addition, there are two different types of crust. The continental crust is the part that is under land, and the oceanic crust is the part under the oceans.Full Answer >
The asthenosphere is a layer of the Earth's interior that includes part of the lower crust and part of the mantle. The upper boundary of the asthenosphere is roughly 50 miles below the ground's surface. Its lower boundary, however, is inconsistent and depends primarily on temperature. Experts at the United States Geological Survey estimate its average thickness as 112 miles.Full Answer >