Small hills are a common geographical feature that can be found in many places around the world. They are typically smaller than mountains and are usually formed by erosion or other natural processes. The term 'small hills' can be used to describe three different types of landforms: KNOLLS, MOUNDS, and RISES. KNOLLS are small, rounded hills that are usually isolated from other hills. MOUNDS are similar to KNOLLS, but they are usually larger and have a more distinct shape. RISES are hills that are slightly higher than the surrounding terrain. All three of these landforms are considered small hills.