The earth's lithosphere is in constant movement and the earth's crust is broken up into pieces

When a cold liguid sinks to the bottom and a hot liquid rises to the top

Gravity pulling on plates in the subduction zones.

New crust pushes the tectonic plates apart

Where the plates move apart from eachother

Rift valleys are caused by divergent blate boundaries

Mid ocean ridges form because of the plates pulling away from eachother

Where two plates collide

Volcanos are results of ocean and continental plates colliding

Volcanic island arcs are formed from two oceanic plates colliding

Mointains are formed from two continental plates colliding

Where two lithospheric plates come together and one plate slides under the other

These formed when one plate subducts under another

Deep ocean trenches form because of subduction

Where two plates slide past eachother

These are a result of two plates rubbing against eachother

Earthquakes are are a result of transform boundaries