The mass movement in which materials move as one large mass is called a slide.

Here's why:

* Slides involve a coherent block of material moving downhill. This can include soil, rock, or even a combination of both. The movement is typically rapid and can be triggered by factors like heavy rainfall, earthquakes, or volcanic activity.

* Other types of mass movement include:

* Flows: Involve a more fluid-like movement of material, like a mudflow or debris flow.

* Creep: Slow, gradual downhill movement of soil or rock.

* Falls: Involve the freefall of material, such as rocks or boulders, from a cliff.

Let me know if you'd like more information on any specific type of mass movement!