The distinction between hills and mountains is not always clear-cut and can be subjective. There's no official, universally accepted definition. However, here are some common ways to differentiate them:

General Perception:

* Hills: Are perceived as smaller, gentler inclines with a more gradual rise and fall.

* Mountains: Are perceived as larger, steeper, more dramatic formations with peaks and valleys.

Elevation:

* Hills: Typically have an elevation below 2,000 feet (610 meters), although this can vary depending on location.

* Mountains: Usually have an elevation above 2,000 feet (610 meters) or higher. However, some regions, like the Appalachians, define mountains as having a minimum elevation of 1,000 feet (305 meters).

Geological Formation:

* Hills: Can be formed through various processes like erosion, volcanic activity, or tectonic uplift. They often have a rounded shape due to weathering.

* Mountains: Typically form through tectonic plate collisions, resulting in steeper slopes and a more dramatic landscape.

Other factors:

* Prominence: Refers to how much a peak stands out above surrounding terrain. Mountains often have higher prominence compared to hills.

* Isolation: Mountains often stand alone or in clusters, while hills can be part of a larger rolling landscape.

Ultimately: The difference between a hill and a mountain is more about perception and local usage than any strict definition. In some regions, a "hill" might be considered a "mountain" in another area.

Here's a helpful analogy: imagine a gradual incline in a park. That's a hill. Now imagine Mount Everest. That's a mountain. Everything in between is open to interpretation!