Explain plate tectonics as one way that the Earth cycles

Tectonic plates are segments of the Earth's lithosphere, the hard rocky outer shell composed of the crust and the uppermost mantle. This shell is divided by lines of faults, ridges of plate creation, and zones of plate destruction. All in all, there are roughly 30 tectonic plates which cover the entire surface of the planet. 

The movement of the plates is caused by the convection currents of heat from the Earth's interior.This Mostly occurs in the middle of the ocean, This heat rising toward the surface through the mantle causes s volcano to form in the middle of the Ocean. when all the Lava/Molten finishes the magma then cools and life starts to form on the volcano and thats how islands are created.

this transfer is call conjunction

b) the inside picture would look at a very high temperature in a very low ph