What are locations where volcanoes form far from plate boundaries called? (Plsss help... also idk why this says college, im in 7th grade)

One such chain of volcanoes can be found on the western coast of the United States, spanning across the states of California, Oregon, and Washington. A divergent plate boundary often forms a mountain chain known as a ridge. This feature forms as magma escapes into the space between the spreading tectonic plates.

Explanation: