Convergent Boundary: A major geologic discontinuity or suture marking the juncture of lithospheric plates that have been joined by plate tectonics.
Divergent Boundary: In plate tectonics, a divergent boundary or divergent plate boundary (also known as a constructive boundary or an extensional boundary) is a linear feature that exists between two tectonic plates that are moving away from each other. Divergent boundaries within continents initially produce rifts which produce rift valleys. Most active divergent plate boundaries occur between oceanic plates and exist as mid-oceanic ridges. Divergent boundaries also form volcanic islands which occur when the plates move apart to produce gaps which molten lava rises to fill.
Transform Boundary: A transform fault or transform boundary, also known as conservative plate boundary since these faults neither create nor destroy lithosphere, is a type of fault whose relative motion is predominantly horizontal in either sinistral or dextral direction
Convection Currents: In meteorology, convectional currents are a form of small to high speed winds and one of the many forms of convection on Earth. These winds can be anything from a few knots to in the 80-100 knot range. These winds are caused by natural convection currents.
Oceanic Crust: Oceanic crust is the part of Earth's lithosphere that surfaces in the ocean basins. Oceanic crust is primarily composed of mafic rocks, or sima, which is rich in iron and magnesium
Continental Crust: The continental crust is the layer of igneous, sedimentary, and metamorphic rocks which forms the continents and the areas of shallow seabed close to their shores, known as continental shelves.