Question: In Which Layer Does Mantle Convection Occur?

What is the special feature of the mantle?

According to Wikipedia, one of the unique traits of the upper mantle is its movement.

Due to the temperature differences between the surface of the Earth and outer core the upper mantle has the ability to flow like a fluid.

It has a soft and weak layer called the asthenosphere which is capable of flowing..

Where does mantle convection occur?

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.

What would happen if mantle convection stopped?

Convection currents within the Earth’s mantle are caused by hot material rising upwards, cooling, then dropping back toward the core. … If the interior of the Earth were to cool enough for convection currents to stop, then the motion of the plates would cease, and the Earth would become geologically dead.

Why is mantle convection important?

This flow, called mantle convection, is an important method of heat transport within the Earth. Mantle convection is the driving mechanism for plate tectonics, which is the process ultimately responsible for producing earthquakes, mountain ranges, and volcanos on Earth.

What would happen if there was no mantle?

The entire solid crust would likely be melted into the core, and the geologic processes of early Earth would start all over again; only this time, the planet would be significantly smaller. … Also, due to the loss of a convective mantle, Earth’s magnetic field would likely be completely dissipated.

What is the difference between upper mantle and lower mantle?

The Mantles They have the upper mantle and the lower mantle. There are very small differences between the two layers. The upper mantle has Olivine (a very special rock), compounds with silicon dioxide, and a substance called Peridotite. The lower mantle is more solid than the upper mantle.

What is the main heat source for mantle convection?

Mantle Convection and Plumes The primary sources of thermal energy for mantle convection are three: (1) internal heating due to the decay of the radioactive isotopes of uranium, thorium, and potassium; (2) the long-term secular cooling of the earth; and (3) heat from the core.

What causes convection cells in the mantle?

Mantle Convection It has long been known that throughout the mantle there are convection currents circulating, caused by the difference in temperature at the earth’s interior and surface. Hot material from the earth’s outer core rises very slowly (over millions of years) throughout the mantle.

What are the effects of convection currents on earth mantle?

Convection also plays a role in the movement of deep ocean waters and contributes to oceanic currents. Inside Earth, the convection of mantle material is thought to cause the movement of the overriding crustal plates, resulting in events such as earthquakes and volcanic eruptions.

How does a convection current work in the mantle?

Convection currents in the air and sea lead to weather. Magma in the Earth’s mantle moves in convection currents. The hot core heats the material above it, causing it to rise toward the crust, where it cools. … The magma can’t continue to rise, so it moves horizontally and sinks back down.

How fast do convection currents in the mantle move?

The convection currents in the much hotter mantle continually move the plates about 1/2 to 4 inches per year.

Is there convection in the mantle?

Mantle convection describes the movement of the mantle as it transfers heat from the white-hot core to the brittle lithosphere. The mantle is heated from below, cooled from above, and its overall temperature decreases over long periods of time. All these elements contribute to mantle convection.

What would happen if the Earth’s mantle temperature were to decrease?

When the Earth has cooled completely, the movement in the mantle will also stop eventually. Then, the plates on the surface will no longer move and there will be fewer earthquakes and volcanic eruptions.

What are two factors that cause convection?

Three factors contribute to set convection currents in motion:heating and cooling of the fluid,changes in the fluid’s density, and.force of gravity.The heat source for these currents is heat from Earth’s core and from the mantle itself.Hot columns of mantle material rise slowly.More items…