Why do volcanoes go dormant?

A volcano forms when the hot melted rock deep under the Earth’s crust bubbles to the surface and breaks through. Sometimes, a volcano will go from active to dormant, meaning it doesn’t erupt anymore. How does that happen? We asked geochemist Kelsey Woody to help us find the answer. Got a question of seismic proportions? Send it to us at BrainsOn.org/contact, and we’ll help find a MAGMAnificent answer! See omnystudio.com/listener for privacy information.