**Why does the removal of material at the base of a slope decrease its stability? The slope now exceeds the angle of repose.**

## Why Does the Removal of Material at the Base of a Slope Decrease Its Stability?

The removal of material at the base of a slope can significantly impact its stability. This is because the material removed affects the overall surface area of the slope and the angle of repose, both critical factors in slope stability. Therefore, when the material is removed from the base of a hill, the strength of the slope is decreased.

The angle of repose is defined as the maximum angle at which a material can be placed without it becoming unstable. It is determined by the characteristics of the material, such as its composition, size, shape, and density. When the material is removed from the base of a slope, the angle of repose decreases, which leads to a decrease in stability. This is because the material’s angle of repose is no longer sufficient to provide adequate support.

The surface area of the slope is also affected when material is removed from the base of a slope. When the material is removed, the surface area of the slope decreases, which can also lead to a decrease in stability. This is because a reduction of surface area means that the material can no longer provide enough support, and the slope is more likely to fail.

In addition to the angle of repose and the surface area of the

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