That feature is Athabasca Valles, a system of valleys carved into volcanic plains ... the processes that shaped this enigmatic Martian landscape. "Rootless cones form when lava flows over wet ...

Mount Spurr is an ice and snow-covered stratovolcano complex, meaning that it is a large, cone-shaped volcano formed by lava flows, pyroclastic deposits, mudflow deposits, and lava domes.

Augustine Volcano showing the typical cone shape, erupting ash cloud, and pyroclastic flows on the snow covered slopes (Photo by U.S. Geological Survey). Click image for a larger view. Along the ...

Criterion (viii): Sangay (a perfect cone-shaped volcano) is notable globally for its long period of continuous activity. The area exhibits a rugged topography with deep, steep-sided valleys, abundant ...

Vents may consist of a single, circular-shaped structure ... Hundreds of dikes can invade the cone and inner core of a volcano, as they do in Nyiragongo, often along zones of structural weakness.

Jeju Volcanic Island and Lava Tubes ... the fortress-like Seongsan Ilchulbong tuff cone, rising out of the ocean, a dramatic landscape; and Mount Halla, the highest in Korea, with its waterfalls, ...