A hill has steep sides because of how the hill formed it formed with steep sides.
I don't agree. Hills have steep sides because of the Earth's plates. When the plates push against each other, they sometimes push up, creating a hill or a mountain. Whether the hill has steep sides or not depends on the factors such as weathering and erosion, and on quite simply how it forms.
An isolated hill with steep sides is known as a butte. It is a narrow, flat-topped hill with steep, vertical sides formed by erosion of softer rock layers surrounding harder rock layers. Buttes are common in arid regions where erosion has sculpted the landscape over time.
plateau
mountin
Butte
applacation mountains
A mountain is a natural formation with steep sides that is larger than a hill. It is characterized by having a peak or summit that rises significantly above its surroundings.
Yellowstone national park
It is a mountain.
A table-shaped hill with a flat top and steep sides is typically called a mesa. Mesas are found in arid and semi-arid regions and are formed through erosion processes exposing resistant rock layers. They are often distinctive landforms in desert landscapes.
escarpment, or plateau:))
3 possibilities: Plateau Butte Mesa
The definition of a butte or buttes in English is an isolated hill(s) or mountain(s) with steep sides usually having a smaller summit that a mesa. Most buttes have steep sides and a flat top.