Volcanism, vulcanism, volcanicity, or volcanic activity is the phenomenon where solids, liquids, gases, and their mixtures erupt to the surface of a solid-surface astronomical body such as a …

4 days ago · Volcanism, any of various processes and phenomena associated with the surficial discharge of molten rock, pyroclastic fragments, or hot water and steam, including volcanoes, …

Visit the rock cycle, Earth’s internal heat, and plate tectonics pages to learn more about volcanism and how this phenomenon is connected to other parts of the Earth system.

Volcanism is the eruption of molten rock (magma) onto the surface of a planet. A volcano is the vent through which magma and gases are discharged.

Aug 25, 2025 · Volcanoes have been an important part of human society for centuries, though their understanding has greatly increased as our understanding of plate tectonics has made …

Apr 17, 2023 · The result of these variables is that a great diversity of volcanic landforms exists. National parks contain nearly the full-range of terrestrial volcanic landforms from active …

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...