Which term describes a long, narrow chain of hills or mountains?

The term that describes a long, narrow chain of hills or mountains is "ridge." A ridge is characterized by its elongated form, typically running parallel to other geographic features such as valleys or other ridges. It forms when geological forces push the Earth's crust upwards, creating a raised area that stretches across a significant distance. Ridges often serve as natural barriers or divide, contributing to the drainage and watershed patterns in the surrounding landscape.

On the other hand, a mountain range refers to a series of peaks or mountains usually connected by high ground, but it encompasses a broader area and may consist of multiple ridges. While hillocks denote smaller, rounded hills, elevations simply refer to areas of higher ground without specifically denoting a chain or elongated feature. Thus, in the context of describing a specific geological formation that is long and narrow, "ridge" is the most precise term.