Such forcing under, as two plates meet, is termed subduction.
The place where plates meet are called plate boundaries.
From the outside corner of the joint where the top plates meet on the ceiling drop a plumb line to the floor.
Mark this point on the floor to indicate the outside corner of the joint where the bottom plates will meet.
Where the different plates meet, they typically interact in one of four ways:
Sometimes two plates meet head-on that happen to be carrying continents on their backs.
Hang a plumb bob on a string from the outside corner of the joint where the top plates meet.
It is an unusual type of triple junction in which the three plates do not meet at a simple intersection.
They seem to be located where the tectonic plates meet or overlap.
So what happens when the two plates meet?