Mass movement and Slope Stability

 Mass wasting occurs when a slope fails:

 A slope fails when it is too steep and unstable for existing materials and conditions. Slope stability is ultimately determined by two principal factors: the slope angle and the strength of the underlying material.

How does mass movement affect slopes?

 Steep and unstable slopes are more likely to have a mass movement than gentle and stable slopes. A fall or topple happens when rocks and other sediments fall through the air and land at the bottom of a slope. Flows are a mixture of water, rock and sediment.