Where do most volcanoes on land formed?

Answer 1

Volcanoes on land away from boundaries are known as continental hot spots. They are formed from rising igneous intrusions, known as mantle plumes. Unlike other volcanoes who form on boundaries (such as the Ring of Fire), continental hot spots need no boundaries. Since hot spots are stationary, and the continental plates are not, the plates move around and subject new parts of the plate to the hot spot. The only thing a land volcano needs is a hot spot. If a continent is experiencing rifting and has divergent boundaries, a volcano on land could also appear as igneous material rises. Continent-continent convergence is unlikely to produce land volcanoes. Continent-oceanic convergence and subduction could also produce volcanoes on the plate that sits above the subducted oceanic plate, which is where most land volcanoes form.

Answer 2

On land, as under the ocean, volcanoes usually occur near the edges of plates. Many volcanoes are found in the midst of mountain ranges (such as Mount St. Helens, in Washington, which is found in the Cascade Range).

A lot of islands are volcanic islands, and these islands, therefor, have volcano mountains on them. However, most volcanoes are dormant or extinct (dormant means they are not currently erupting, and extinct means that they will never erupt again).