Convergent Boundary: The boundary between tectonic plates that are colliding. Places where plates crash or crunch together are called convergent boundaries. Plates only move a few centimeters each year, so collisions are very slow and last millions of years. Even though plate collisions take a long time, lots of interesting things happen
Divergent Boundary: A tectonic boundary where two plates are moving away from each other and new crust is forming from magma that rises to the Earth's surface between the two plates. The middle of the Red Sea and the mid-ocean ridge (running the length of the Atlantic Ocean) are divergent plate boundaries.
Transform Boundary: The Boundary between tectonics plates that are sliding past each other horizontally
Convection Currents: the transfer of heat by the mass movement of heated particles into an area of cooler fluid
Oceanic Crust: The relatively thin part of the earth’s crust that underlies the ocean basins. It is geologically young compared with the continental crust and consists of basaltic rock overlain by sediments.
Continental Crust: The relatively thick part of the earth’s crust that forms the large landmasses. It is generally older and more complex than the oceanic crust.