In this section, you will draw a cross-section diagram that shows what occurs at the boundary between two plates.

As an AI text-based model, I cannot directly create or draw diagrams. However, I can describe to you an example of a cross-section diagram that shows what occurs at the boundary between two plates.

Imagine a cross-section diagram that depicts the boundary between two tectonic plates, specifically a convergent plate boundary where two plates are colliding.

1. Label the two plates involved in the collision, such as the "Plate A" and "Plate B".
2. Draw two arrows representing the direction of plate motion. For example, if Plate A is moving towards Plate B, the arrow for Plate A should be pointing towards Plate B, and vice versa.
3. Indicate the types of plates involved. If one plate is an oceanic plate and the other is a continental plate, you can use different colors or patterns to differentiate them.
4. Show the subduction zone on the diagram. If an oceanic plate is subducting beneath a continental plate, draw a downward curving line that represents the subducting oceanic plate. Label it accordingly.
5. Depict the formation of a volcanic arc. On the continental plate, draw a line of volcanoes or a mountain range that represents the volcanic arc formed as a result of subduction.
6. Include the presence of a trench. On the oceanic plate, draw a curved line representing the trench formed at the subduction zone.
7. Indicate the zone of collision. Show the area where the collision between the two plates occurs by labeling it, or drawing a dashed or solid line along the boundary where the plates meet.

Remember, it is important to label each part of the diagram clearly and provide an explanatory key, if necessary, to clarify the various features of the plate boundary.