As seismic activity within the volcano increases, the crater periodically contains an ... a large elongated fissure or fracture (as seen on the diagram above) or a tiny ground crack.

The crater is created after an eruption blows the top off the volcano. An eruption occurs when pressure in the magma chamber forces magma up the main vent, towards the crater at the top of the ...

Today, Crater Lake and the partially lake-filled caldera offer a unique peak inside a volcano (although not as unique as going inside the volcano, Thrihnukagigur, in Iceland). The rim of the ...

Around 900 years ago, a volcano – which has come to be called Sunset Crater – erupted and transformed the encircling area. Geologic features like cinders, lava rock and lava flow compose this ...

Well, now you do. The remains of it are still around, and you can discover them for yourself: Sunset Crater Volcano, located in the Coconino National Forest, just a short drive from Sedona ...

That was reassuring, at least for the time being. The crater was formed when Askja, a volcano in Vatnajokull National Park in Iceland’s central highlands, uncorked in an explosive eruption in 1875.