Introduction:
Mass movement refers to the transfer of rock debris and soil down the slopes under the direct influence of gravity. It is an essential process in shaping the Earth's surface and plays a significant role in various natural phenomena such as landslides, rockfalls, and soil creep. In this answer, we will discuss the statement and determine which of the given statements are correct.

Explanation:
To determine the correctness of the given statements, let's evaluate each one individually:

Statement: Mass movement is the transfer of mass of rock debris and soil down the slopes under the direct influence of gravity.

Explanation: This statement is correct. Mass movement involves the downward movement of rocks, debris, and soil on slopes due to the force of gravity. It occurs when the shear stress acting on a slope exceeds the shear strength of the materials present, leading to their downslope movement.

Supporting points:
1. Types of mass movement: There are various types of mass movement, including landslides, rockfalls, slumps, and soil creep. Each type involves the movement of different materials (such as rocks or soil) and occurs under specific conditions.
2. Causes of mass movement: Mass movement can be triggered by several factors, such as intense rainfall, earthquakes, human activities, or changes in slope angle or vegetation cover. These factors can weaken the stability of slopes, making them prone to mass movement.
3. Factors affecting mass movement: The occurrence and intensity of mass movement depend on various factors, including slope steepness, soil or rock type, water content, and vegetation cover. Steeper slopes, loose or weathered materials, high water content, and lack of vegetation increase the likelihood of mass movement.

Conclusion:
In conclusion, the given statement is correct. Mass movement involves the transfer of rock debris and soil down slopes under the direct influence of gravity. It is a crucial process in shaping the Earth's surface and can be triggered by multiple factors. Understanding mass movement is essential for managing and mitigating the associated hazards, such as landslides, to ensure the safety of human settlements and infrastructure.