Volcanoes can look like small mountains or hills. A volcano is an opening in the Earth's crust that allows magma, hot ash and gases to escape. Composite volcanoes are the most common type of volcano.

Forty years after the Nevado del Ruiz volcano wiped out the town of Armero, the ghosts of Colombia's deadliest tragedy still haunt its slopes, and families are still searching for lost children.

Tom Felton has returned to the Wizarding World. The actor played titular star Dawson Leery in the teen drama from 1998-2003. Interim CEO Ken Cook addressed the closures on a company earnings call.