For Diagram 1 (Divergent Boundary), we draw two thick arrows pointing away from each other, originating from the center of the diagram.
The arrows represent the plates moving apart at a divergent boundary. Label one arrow "Plate A" and the other "Plate B" to indicate the specific plates involved.
In Diagram 2 Convergent Boundary, we draw two thick arrows pointing towards each other, with their tips meeting at the center of the diagram and the arrows represent the plates colliding at a convergent boundary. Label one arrow "Plate A" and the other "Plate B" to indicate the specific plates involved.
For Diagram 3 Transform Boundary, we draw two thick arrows sliding past each other horizontally, with their tips touching at a central point. These arrows represent the plates sliding past each other at a transform boundary. Label one arrow "Plate A" and the other "Plate B" to indicate the specific plates involved.
Finally for Diagram 4, we draw a thick arrow representing the oceanic plate pointing towards a thick arrow representing the continental plate. The oceanic plate arrow should have its tip pointing beneath the continental plate arrow.