Why do convection currents happen in the mantle?

Answer 1

The convection currents are a result of heat from the interior of the Earth. The rock of the upper mantle known as the asthenosphere is plastic-like but not molten. It acts like a conveyor belt, moving heat from Earth's interior upward, and cooled material downward in a big loop. New crust is created where mantle material reaches the surface at places called mid-ocean ridges. Older, colder oceanic crust is subducted and drawn into the mantle, completing the loop.

Answer 2

Convection Currents

The mantle is made of much denser, thicker material, because of this the plates "float" on it like oil floats on water.

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. The next time you heat anything like soup or pudding in a pan you can watch the convection currents move in the liquid. When the convection currents flow in the mantle they also move the crust. The crust gets a free ride with these currents. A conveyor belt in a factory moves boxess like the convection currents in the mantle moves the plates of the Earth.

Convection currents are caused by the inner core, which is the Inner layer of the Earth.

Convection currents begin due to the extreme heat of the inner core. The inner core heats up the very bottom of the mantle. The heated up substances within the mantle has a higher temperature than those higher in the mantle and closer to the surface of the earth. The particles of the heated substances spread out because they are moving more quickly, and they become less dense and rise to the top of the mantle, pushing the cooler substances down towards the bottom of the mantle. Thus, the process of convection continues.
Convection currents are caused by the heat from the inner core. A layer in the mantle, called the asthenosphere, is fluid-like and is heated by the core, thus inducing convection currents to form.
Earths outer core.
The heat from the gradual decay of long lived radioisotopes creates areas of upwelling within the mantle material. The material that rises causes adjacent material to descend to fill the void. This motion occurs over very broad areas, and is what drives sea floor spreading and plate tectonics. It all boils down to nuclear decay.

Answer 3

Because the core of the Earth is hot (heated by the radiogenic decay of isotopes carried there during the iron cascade) and the convection currents are the process whereby this heat is transferred to the earths surface. Just like a pot of soup heating up on a stove.

Answer 4

Convection Currents occur when the heat from the earths core rises and heats up the mantle. the particles then become less dense and rise but when reaching the surface or top they cool back down, become more dense and heavy therefore dropping

Answer 5

Yes, there are convection currents in the mantle.