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 …

Nov 17, 2025 · Strictly speaking, the term volcano means the vent from which magma and other substances erupt to the surface, but it can also refer to the landform created by the …

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.

The meaning of VOLCANIC is of, relating to, or produced by a volcano. How to use volcanic in a sentence.

Nov 15, 2025 · Volcanic Ash Advisory Center (VAAC) Tokyo warned about a volcanic ash plume that rose up to estimated 9000 ft (2700 m) altitude or flight level 090 and is moving at 10 kts in …

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

Jun 13, 2025 · It is within the mantle, especially in its upper regions, that most volcanic activity is born. Here, temperature and pressure conspire to partially melt rock, forming magma. This …

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...

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

Volcanic processes include phenomena that occur before, during, and after volcanic eruptions, and also volcano-related processes that impact them between and after eruptions.