Here's why:

* Formation: Cinder cones are formed by the accumulation of tephra (fragments of volcanic rock) that are ejected from a volcanic vent during explosive eruptions.

* Shape: They typically have a steep, conical shape, often with a bowl-shaped crater at the summit.

* Size: While they can vary in size, they usually rise up to several hundred feet, and in some cases, can reach heights of over 1,000 feet.

Examples:

* Paricutin volcano in Mexico: This famous cinder cone grew from a cornfield in 1943 and reached a height of over 1,000 feet in just a few years.

* Sunset Crater in Arizona: This cinder cone is a popular tourist destination and is known for its distinctive red color.

So, remember, a cinder cone is a steep, conical hill formed by the accumulation of volcanic tephra.