Final answer:
Gravity and moisture are the two key factors used to classify types of mass wasting, affecting the movement of materials and soil characteristics.
Step-by-step explanation:
The factors that can be used to classify types of mass wasting are Gravity and amount of moisture present. Gravity is the primary force that drives the movement of soil, rock, or debris down a slope. The amount of moisture in the material affects its weight and the cohesion between particles, thus influencing the likelihood and type of mass wasting event. Types of mass wasting include landslides, mudflows, and rockfalls, each with varying speeds of movement and moisture content. The climate plays a crucial role, with temperature and moisture impacting soil characteristics and contributing to biological activity, which is essential for quality soil.