Oct 2, 2025 · A volcanic eruption is an eruption of molten rock, hot rock fragments, and hot gases through a volcano, which is a vent in a planet’s or satellite’s crust. Volcanic eruptions can …

A volcano is commonly defined as a vent or fissure in the crust of a planetary-mass object, such as Earth, that allows hot lava, volcanic ash, and gases to escape from a magma chamber …

Volcanoes are openings, or vents where lava, tephra (small rocks), and steam erupt onto the Earth's surface. Volcanic eruptions can last days, months, or even years.

Volcanoes are Earth’s geologic architects. They’ve created more than 80 percent of our planet’s surface, laying the foundation that has allowed life to thrive. Their explosive force crafts...

Each type of volcano has a characteristic size and form, eruption type (s) and style, eruption period/longevity, rock type (s), and sets of volcanic features. There is an interplay between …

Articles, facts, information and photos for volcanoes and volcanic activity. | Geology.com

Apr 22, 2024 · Know how to prepare for and protect yourself during and after volcanic eruptions.

Jun 17, 2025 · Most volcanoes form at the boundaries of Earth’s tectonic plates. These plates are huge slabs of Earth’s crust and upper mantle, which fit together like pieces of a puzzle. These …

Sep 29, 2025 · Volcano, vent in the crust of Earth or another planet or satellite, from which issue eruptions of molten rock, hot rock fragments, and hot gases. The term volcano can also refer …

A volcanic eruption occurs when material is expelled from a volcanic vent or fissure. Several types of volcanic eruptions have been distinguished by volcanologists.