The place where movement occurs between two rock masses is called a fault.

Here's a breakdown:

* Fault: A fracture or zone of fractures in the Earth's crust where there has been movement.

* Rock Masses: Large sections of rock on either side of the fault.

Types of Movement:

* Strike-Slip: Rocks slide past each other horizontally.

* Dip-Slip: Rocks move vertically, either up or down.

* Oblique-Slip: Rocks move both horizontally and vertically.

Examples:

* San Andreas Fault: A famous strike-slip fault in California.

* Wasatch Fault: A major fault zone running along the Wasatch Range in Utah.

Faults are important geological features that can cause earthquakes, influence the landscape, and provide access to natural resources.