Eruptions are explosive, producing large volumes of ash, pyroclastic flows, volcanic bombs and poisonous gases. The lava is andesitic, meaning it has a high gas content and is very viscous.

As it rumbled beneath thin points in the Earth’s crust in the area, the junction’s passage unleashed a complex series of lava flows known as the Sonoma ... including minerals such as rhyolite, ...

Eruptions are explosive, producing large volumes of ash, pyroclastic flows, volcanic bombs and poisonous gases. The lava is andesitic, meaning it has a high gas content and is very viscous. The lava ...

Explore the natural and historic landmarks of Oregon, including gorges, waterfalls, rock formations, and vibrant cities.

That, and it's not a great idea to attempt to plug them up with concrete. The most common type of lava flow is basaltic, making up around 90 percent of all lava flows on the planet. In these flows ...

Satellite imagery has revealed the dramatic extent of an eruption that kicked off just before Christmas, with fountains pouring lava across hundreds of acres.

shows shows lava fountains feeding lava flows across the caldera floor as sun rises. The volcano is one of the world’s most active, and has erupted dozens of times since 1952, according to the USGS.

shows shows lava fountains feeding lava flows across the caldera floor as sun rises. The volcano is one of the world’s most active, and has erupted dozens of times since 1952, according to the USGS.

Researchers have discovered an underground aquifer in Oregon's Cascade Range is significantly larger than previously thought ...