Material begins to clump together as it moves away from the center of the Big Bang. Nebular means cloud. Our sun is a second generation star. Iron is the heaviest element that can be created in a star through nuclear reactions. Convergent motion means that the plates are moving toward one another.
Divergent motion means that the plate are moving apart from one another.
Transform motion occurs where a plate slides beside another plate. The San Andreas Fault is also a transform fault. Plate movement generates earthquakes, volcanic activity, mountain ranges and major topographic features. Rock Cycle - see textbook.