Io is an incredibly active and extreme place, with glistening lava lakes and volcanic eruptions shooting sulfur and magma to ...

In Michigan's upper peninsula lies one of the world's oldest and largest lava flows. It's housed in a historic park, and it ...

Left: A close-up of a crack in the volcanic surface of a cooled lava flow from the crater of Mt. St. Helens.

As it pours down the volcano, the lava at the surface is cooled by the air and solidifies, creating an elastic, skinlike outer layer. Beneath this inflating membrane, the lava continues to ooze ...

Intrusive indicates that the magma was forced close to the surface, but then cooled more slowly underneath the surface. When lava erupts from a volcano, it can be as much as 10 times hotter than ...