Koryaksky volcano, 3456m high, conical andesite volcano, Kamchatka, East Siberia, Russia

An active andesite stratovolcano on White Island, off the east side of North Island, New Zealand, Pacific

Boiling mud at an active andesite stratovolcano on White Island, off the east side of North Island, New Zealand, Pacific

Visitors to an active andesite stratovolcano on White Island, off the East side of North Island, New Zealand, Pacific

Mud being ejected from the caldera floor of an active andesite stratovolcano on White Island, North Island, New Zealand, Pacific

Mud being ejected from the caldera floor of an active andesite stratovolcano on White Island, North Island, New Zealand, Pacific

Visitors watching mud being ejected from the caldera floor of an active andesite stratovolcano on White Island, North Island, New Zealand, Pacific

The caldera floor of an active andesite stratovolcano on White Island, North Island, New Zealand, Pacific

An active andesite stratovolcano on White Island, off the east side of North Island, New Zealand, Pacific

An active andesite stratovolcano on White Island, off the east side of North Island, New Zealand, Pacific

Koryaksky volcano, 3456m high, conical andesite volcano, Kamchatka, East Siberia, Russia

Visitors at an active andesite stratovolcano on White Island, North Island, New Zealand

Visitors at an active andesite stratovolcano on White Island, North Island, New Zealand, Pacific

An active andesite stratovolcano on White Island, off the east side of North Island, New Zealand, Pacific

November 30, 2012 - Glowing Rerombola lava dome of Paluweh (or Rokatenda) volcano during eruption in 2012, Flores, Indonesia.

November 30, 2012 - Glowing Rerombola lava dome with incandescent rockfall deposit, Paluweh volcano, Flores, Indonesia.

Visitors at an active andesite stratovolcano on White Island, North Island, New Zealand, Pacific

Koryaksky volcano, 3456m high, conical andesite volcano, Kamchatka, UNESCO World Heritage Site, Eastern Siberia, Russia, Eurasia

Tupacos wall with its gray andesite blocks on San Agustin street, Cuzco, UNESCO World Heritage Site, Peru, South America

Women with traditional dress along Tupac Yupanqui Palace Hotel wall with its gray andesite blocks on San Agustin street, Cuzco, UNESCO World Heritage Site, Peru, South America

Visitors at an active andesite stratovolcano on White Island, North Island, New Zealand, Pacific

Visitors at an active andesite stratovolcano on White Island, North Island, New Zealand, Pacific

Scenic landscape of glacial meltwater running through andesite lava river channel in highlands of Iceland