Must be moving at a constant velocity
Hope this helps :)
<span>Many of the sensory and motor functions are controlled by the central nervous system and the brain. An example of this would be grabbing a hot pot from the stove. Your brain sends a signal to your hand to tell it to grab the pot. When you grab it your sensory nerves detect that the pot is hot and is burning your hand. The signal it sends back to the brain is one that there is pain and to release the pot.</span>
Answer is for the earths core to cool enough for convection to stop, then the plates would have no convection current to move them.
Explanation: If the Earth's core were to cool down, the convection currents in the mantle would stop moving. Since the convection currents drive the plates, they would stop moving.
Axon, dendrite
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Respiratory system and Circulatory system :P