Question: What Does Not Play A Role In Convection In The Mantle?

Why are two plates spreading considered to be constructive?

The constructive plate of the Atlantic ocean is thus expanding plate margin and the pacific is shrinking plate as it formed near the destructive plate boundary.

The spreading enable the plates to move further apart and thus is considered to be constructive..

How do convection currents cause the plates to move?

Convection currents describe the rising, spread, and sinking of gas, liquid, or molten material caused by the application of heat. … Tremendous heat and pressure within the earth cause the hot magma to flow in convection currents. These currents cause the movement of the tectonic plates that make up the earth’s crust.

Why do convection currents turn left?

At point C the magma is cooling, as the magma cools the particles move slower and the density increases and gravity pulls the magma back towards the core. What causes the convection cell to turn to the left at point B? … The force of gravity causes the material to fall back towards the core at point C.

What temperatures are associated with mantle convection?

The temperature of the mantle varies greatly, from 1000° Celsius (1832° Fahrenheit) near its boundary with the crust, to 3700° Celsius (6692° Fahrenheit) near its boundary with the core. In the mantle, heat and pressure generally increase with depth. The geothermal gradient is a measurement of this increase.

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 is a constructive force in the mantle?

Three of the main constructive forces are crustal deformation, volcanic eruptions, and deposition of sediment. … Crustal deformation occurs when the shape of land (or crust) is changed or deformed. One of the main causes is movement of the Earth’s plates.

What causes the mantle to flow?

The mantle flows because of convection currents that are caused by very hot material in the mantle rising, cooling, and then sinking. This circular pattern causes the mantle to flow.

What is a destructive force in the mantle?

constructive forces. forces that construct, or build up, mountains. destructive forces. because forces such as ice, rain, wind, and changing temperatures wear down, or destroy, landmasses. how do geologists learn about earth’s interior?

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…

How does convection work in the mantle?

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. … This hot added material cools down by conduction and convection of heat.

Which of the following processes leads to convection in the Earth’s mantle?

Convection Currents in the Mantle Heat in the mantle comes from the Earth’s molten outer core, decay of radioactive elements and, in the upper mantle, friction from descending tectonic plates.

Which layer does mantle convection occur?

AsthenosphereMantle convection occurs in the: Asthenosphere.

What will happen to the convection currents in the mantle of Earth’s interior eventually cools down?

Explanation: 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.

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.

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.

What is a destructive force caused by the convection in the mantle?

Answer: convergent margins. Explanation: Mantle convection causes the phenomenon of plate tectonics on the earth surface. From plate tectonics, we understand that the earth surface is broken into several giant slabs made up of the crust and upper part of the mantle.

Why is convection current important?

Convection currents play a role in the circulation of fluids. Convection currents are the result of differential heating. Lighter (less dense), warm material rises while heavier (more dense) cool material sinks. … Convection also plays a role in the movement of deep ocean waters and contributes to oceanic currents.