Learn about how volcanoes are formed and the ways they erupt Chiara Maria Petrone, Roberto Scandone, and Alex Whittaker On ...

This is a repost from the archives, an older post by Henrik which has been updated to reflect more recent findings. Did you know there are 255 volcanoes or volcanic features listed in the US?

Lassen Peak is the largest plug dome volcano in the world and a signature feature of the park. Need a break? Play the USA TODAY Daily Crossword Puzzle.

Skip Yosemite’s crowds and explore otherworldly landscapes with lava fields and steaming fumaroles along epic hikes in this California hidden gem.

An extinct volcano is lying hidden in Carlsbad's Calavera Nature Preserve in north San Diego County. Welcome to Mount Calavera!