Convection currents are identified in Earth’s mantle. Heated mantle material is shown rising from deep inside the mantle , while cooler mantle material sinks, creating a convection current.
What are the main causes of convection currents?
Convection currents form because a heated fluid expands, becoming less dense . The less-dense heated fluid rises away from the heat source. As it rises, it pulls cooler fluid down to replace it. This fluid in turn is heated, rises and pulls down more cool fluid.
What causes convection currents in mantle?
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 is the main cause of convection currents in the mantle Brainly?
Answer Expert Verified
Heat from the core and the mantle itself causes convention currents in the mantle.
What causes the convection currents in the mantle quizlet?
It is caused by the difference in temperature and density. ... Heating and cooling of the fluid, changes in the fluid density, and the force of gravity, combine to set convection currents in motion. Heat from the core and the mantle itself cause convection currents in the mantle.
What is convection current 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.
What is the process of mantle convection?
Mantle convection is the process by which the excess heat in the Earth’s deep interior is transferred to its surface through the fluid-like motions of the rocks in the mantle . ... Convection occurs in the Earth’s mantle because it is the most efficient way for the Earth to cool or dispose of its deep-seated heat content.
What happens when convection currents occur?
convection currents occur when a heated fluid expands, becoming less dense, and rises . The fluid then cools and contracts, becoming more dense, and sinks.
What is happening with convection?
rock cools, the density increases , causing the material to sink. What causes the convection cell to turn to the left at point B? lithosphere forcing the convection current to turn left. ... Temperature increases (closer to the core) and density decreases as a result.
How are convection currents important to the Earth?
Convections currents in the earth’s mantle are thought to be the driving force of plate tectonics . Where the hot magma is brought near the surface by the convection currents a divergent boundary is created. The divergent boundaries form new oceans and widen existing oceans.
Which two things do convection currents create?
The two processes work in conjunction with each other. 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.
What causes convection currents in air?
Convection currents form because a heated fluid expands, becoming less dense . The less-dense heated fluid rises away from the heat source. As it rises, it pulls cooler fluid down to replace it. This fluid in turn is heated, rises and pulls down more cool fluid.
Where does the heat come from that drives this convection current in the mantle?
Question One: Where does the heat come from that drives this convection current in the mantle? The heat driving the convection current in the mantle comes from the extreme temperature in the earth’s core, and the heat from the mantle itself .
What does not play a role in convection in the mantle?
The core does not play an active role in mantle convection. The magnitude of the bottom TBL depends on the cooling rate of the mantle, the pressure and temperature dependence of the physical properties and the radioactivity of the deep mantle.
What would happen if convection currents in the mantle 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.
What causes the mantle to flow?
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.
