geology

Chert is a microcrystalline to cryptocrystalline sedimentary rock composed essentially of silica in the form of quartz. It forms in marine and lacustrine settings, often precipi...

San Miguel is a steep-sided stratovolcano in eastern El Salvador, known for repeated eruptions that commonly produce ashfall, lahars, and localized damage. This overview explain...

A mile-wide volcano in the Pacific Ocean is a large undersea or island volcano whose summit spans approximately one mile (about 1.6 kilometers) across. These structures form thr...

Is Mauna Loa active? Yes. By scientific definition, Mauna Loa is an active volcano, meaning it has erupted within the last several thousand years and is likely to erupt again. I...

A cliff collapse in Sicily is a geomechanical event in which coastal or inland steep slopes fail under the combined influence of rock or soil weakness, water, and gravity. In Si...

Iceland black rocks are primarily dense, dark volcanic rocks, most commonly basalt, formed by extensive lava flows that cooled rapidly after meeting ocean water or air. These ro...

The Cumbre Vieja eruption on La Palma in 2021 was neither the largest nor the most deadly global event, but it is one of the best-documented volcanic crises of the modern satell...

Mauna Loa is approximately 700,000 to 1,000,000 years old, making it one of the largest and most mature shield volcanoes on Earth. It began as a seamount beneath the ocean and e...