Boundaries between plates are made up from a system of faults. Each type of boundary is associated with one of three basic types of fault, called normal, reverse and strike-slip faults.
You can use pieces of foam or card to model the movement of tectonic plates in different kinds of faults and boundaries. The images below show simple foam models of faults: those on the left show ‘before slippage’ and those on the right ‘after slippage’.
Normal faults are associated with divergent plate boundaries: for example, the Mid Atlantic Ridge that is exposed above sea level through Iceland.
Reverse faults (or 'thrust' faults) are found at convergent boundaries. They are associated with mountain ranges, such as the Himalayas or the Andes.
Strike-slip faults occur at transform boundaries: for example, a system of strike-slip faults makes up the transform boundary of the San Andreas fault.