What is the difference between mass movement and erosion?

Mass movement:

Mass movement is the movement of masses of bodies of mud, bedrock, soil, and rock debris, which commonly happen along steep-sided hills and mountains because of the gravitational pull. That means, air, water or ice do not carry debris with them from place to place but on the other hand, the debris may carry with it air, water or ice.

Erosion:

Erosion involves the acquisition and transportation of rock debris. When massive rocks break into smaller fragments through weathering and any other process, erosional geomorphic agents like running water, groundwater, glaciers, wind and waves remove and transport it to other places depending upon the dynamics of each of these agents.

Further Reading:

• Mass Movements
• Erosional landforms