When volcanoes like Alaska’s Mount Spurr erupt, the ash can damage people’s lungs, smother crops and kill animals, and the harm can continue to spread long afterward.

For a few days in 1959, the cast of “Journey to the Center of the Earth” assembled near Amboy where the cinder cone was called upon to display its cinematic versatility.

If Io did have a sub-surface ocean of magma, the moon would deform under Jupiter's gravity by a significant amount. However, the Doppler measurements suggest that Io is pretty rigid, which means that ...