Below are two blocks with horizontal layers.  In the the movie on the left, you can rotate a block that has already been faulted.  On the right, you can rotate the block and change the offset of the fault. 

Note that the movement is dip-slip, in this case down the dip of the fault. This type of dip-slip fault is called a normal fault (it seems normal for the block above the fault to slip down this way).

Rotate block

Rotate block  Offset fault

Continue to the next page to examine different types of faults.

Faults - Normal