Answer :

the mass is a fast process in the form of a landslide the mass is a slow process in the form of a creep

Creep denotes the slow downslope movement of particles that occurs on every slope covered with loose, weathered material. Landslide on the other hand is the movement of a mass of rock, debris, or earth down a slope.

The main difference between these two movements is the rate of flow. Creep is much slower than the landslide.