Why do lithospheric plates move?
The theory of plate tectonics suggests that the lithospheric plates move because of convection currents in the semi molten mantle.
When a hot liquid cools, convection currents are seen on its surface; if the liquid contains any minerals that can solidify, these minerals are seen to form plate-like structures; there are down currents on the edges where the cooled liquid descends back to the bottom and up currents in the middle where the heated liquid rises to the surface.
Similar processes are thought to occur in the semi-molten mantle, where hot spots are created by the liquid outer core heating the mantle and forcing material from the mantel to rise to the surface as magma, forming new crust, and pushing the old magnetized crust away from the hot spot. The resultant pressure from the rising material from the hot spot causes the crust to move in the form of lithospheric plates.
Subduction zones are thought to be the deep ocean trenches off the coasts of South America and other places, where cooled crust sinks and is forced back down into the mantle, destroying the ocean crust and its sedimentary layers that have been preserved. The destruction of ocean plates allows for the formation of new ocean crust at mid-ocean ridges.
The motion of the tectonic or lithospheric plates appears to be explained by the analogy of convection currents in the mantle.
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Lithospheric plates move due to convection currents in the Earth's mantle, caused by heat from the core.
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When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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