Cinder cones are simple volcanoes that form where vents, or openings, spit out ash and lava. They can be cone- or oval-shaped, usually with a bowl-like crater at their summits. When a cinder ...

In 1831, a massive volcanic eruption in the Kuril Islands sent sulfur-laden ash high into the sky, cooling the planet and tinting the Sun green. The volcano, known as Zavaritzki, remained a mystery ...

Increasing volcanic activity at the over 11,000-foot-tall, snowcapped volcano in Alaska is likely a sign of its impending first eruption since 1992, experts say. Mount Spurr, located about 75 miles ...

Eruptions of steam, ash, and tephra continued until ... try Lassen Peak. Four types of volcanoes—shield, composite, cinder cone, and plug dome—can be found in Lassen Volcanic National Park ...

But the amount of ash that would spew forth from this volcano could pose a threat to human health, causing breathing difficulties and releasing toxins linked to cancer. The last time Mount Spurr ...

Ash released from shield volcanoes often builds up around the vent forming a steep, round hill known as a cinder cone. A lava tube may also form, beneath the surface of the ground, when low ...

For 25 million years, volcanos spewed molten rock and ash across New Mexico, forming craters, super volcanos, cinder cones, lava flows and peak-less mountains. Over time, these massive eruptions ...

Volcanologists at the Alaska Volcano Observatory have been monitoring volcanic unrest since April of last year.