Lava tubes are pretty cool. Wikipedia says, “Lava tubes are natural conduits through which lava travels beneath the surface of a lava flow, expelled by a volcano during an eruption. They can be actively draining lava from a source, or can be extinct, meaning the lava flow has ceased and the rock has cooled and left a long, cave-like channel.” In other words, sometimes the exterior of a lava flow hardens while the inside is still molten, allowing the lava to move out of the hardened tube, creating a cave.
Check out Ape Cave, a lava tube south of Mount St. Helens in Washington that is 1900 years old. There are two entrances to this 13,042 feet (3,975 m) long tube. Choose your entrance carefully!
Pico Cão Grande
This landmark needle-shaped volcanic plug peak is located in the south of São Tomé Island in Obo National Park. It rises dramatically over 300 m (1,000 ft) above the surrounding terrain and the summit is 663 m (2,175 ft) above sea level.
(via fyeahgeology)
Tungurahua Volcano, Ecuador. Martin Rietze.
Mount Etna, Italy.
Mount Etna, Italy.
“Temporarily the moon is hidden behind a small but dense cloud of steam, while a particularly strong eruption occurs from NE cone.” Stromboli, Italy.
Stromboli, Italy.
Ruapehu, New Zealand. Hans Aeschlimann.
![[ … Eruption ] by Raymond Hoffmann. (Iceland)](http://24.media.tumblr.com/tumblr_lufhmfjYwD1r2pya0o1_r1_1280.jpg "[ … Eruption ] by Raymond Hoffmann. (Iceland)")
Alien landscape at home #1: Kilauea eruption with molten lava and papaya trees near Kapoho, Hawaii, unknown photographer, 1960.
(via unacclimated)
Tavurvur volcano, Papua New Guinea.
(Source: fabrizi0, via fyeahgeology)
