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Convection currents are in the liquid and gas states.
convectional currents in the mantle are themselves driven by the heat of the core. the heat is partly created of overlaying material. A lava lamp is a perfect example of convectional
The inner core is solid, but the mantle is the only layer of Earth that flows in currents. These currents are caused by convection. If you don't know what convection is then you might as well look it up because I don't have a good definition.
Mantle convection currents move the crustal plates that float atop the mantle. Like convection currents in a hot cup of coffee or tea move pepper flakes or pieces of glitter sprinkled on top and floating on the liquid.
there are convection currents in the upper core.
Convection currents from the stove or microwave.
It falls back down
Convection currents occur in any fluid in which there is a temperature differance. Most convection currents occur in the mantle, the layer of semi-liquid rock below the crust. These currents are the reason behind plate tectonics.
The liquid or gas which transfers the heat can circulate round and round between the hot and cold regions. The flow of liquid or gas is called a convection current. Convection currents are caused by changes in density.
because convection currents are caused by the liquid being heated, becoming less dense due to increased kinetic energy and rising. if you are heating the top of the test tube, there is nowhere for them to 'rise' to, so no current is formed, as they do not reach a place where they cool and sink to the bottom. thus convection currents are only formed when heating the bottom of a test tube.
Convection currents are transferring heat to the surface through the movement of mantle rock. If the interior of the planet cools, the mantle rock would be too solid to move, and there would be no heat to transfer.
Nothing actually happens to convection currents when heat is no longer supplied. The currents are produced by applying heat, most often to the bottom. The warmed fluid is 'lighter' than the cold fluid surrounding so it rises to allow colder fluid to replace it and be heated. As soon as the heat is removed, all the fluid rapidly comes to a single temperature and convevtion does not happen! An opposite effect happens when cold air sits on the surface of a lake. In this case the water at the surface cools, gets 'heavier' and sinks. In this case the convection currents operates downwards.
Convection currents are in the liquid and gas states.
convection happens in liquid
Convection currents occur in liquid. Heat excites the matter near the source and causes it to rise, making nearby matter rush in to fill the space. Then that matter is heated, rises, and so on. A good example of this is the Earth's mantle: heat from the core is dispersed by convection currents.
Convection currents.
If Earth's interior cools to a non liquid state, the convection currents will stop.