Convergent Boundary: the boundary between tectonic plates that are colliding.
Divergent Boundary: the boundary between tectonic plates that are moving away from each other
Transform Boundary: the boundary between tectonic plates that are sliding past each other horizontally
Convection Currents: the movement of matter due to differences in density that are caused by temperature variations; can result in the transfer of energy as heat.
Oceanic Crust: The oceanic crust is the part of the earth's crust that is below the ocean. The rock that makes up the oceanic crust is about 200 million years old.
Continental Crust: Continental crust is a layer of igneous, sedimentary as well as metamorphic rocks. This layer structures the continents and the regions of shallow seabed close to their shores which are called continental shelves.