volcano

Volcano

An opening in the Earth's surface where molten rock (magma) escapes, becoming lava when it reaches the surface.

Magma

Molten rock located beneath the Earth's crust that can rise to form a volcano.

Lava

Magma that has reached the Earth's surface.

Shield Volcano

A type of volcano with gentle slopes formed by low-viscosity lava flows, e.g., Mauna Loa.

Stratovolcano

A volcano with steeper slopes formed by layers of ash and lava from explosive eruptions, e.g., Mount Fuji.

Cinder Cone Volcano

A small, steep-sided volcano built from particles and blobs of congealed lava, e.g., Parícutin.

Caldera

A large depression formed when a volcano collapses after an eruption, e.g., Yellowstone Caldera.

Eruption

The process where pressure from gases in magma forces it out of a volcano's vent, resulting in lava flow or explosive activity.

Lava Flow

Streams of molten rock that pour from a volcano during an eruption.

Ash Cloud

A cloud of ash, gas, and volcanic debris ejected into the atmosphere during an explosive eruption.

Tephra

Fragmented material ejected during a volcanic eruption, including ash and volcanic bombs.

Pyroclastic Flow

A fast-moving current of hot gas and ash that flows down a volcano during an explosive eruption.

Magma Chamber

A large underground pool of molten rock where magma accumulates before an eruption.

Vent

The opening at the Earth's surface through which magma escapes from the magma chamber.

Crater

A bowl-shaped depression at the summit of a volcano formed by explosive eruptions.

Cone

The main body of the volcano built up by layers of solidified lava, ash, and volcanic rocks.

Tectonic Plate Boundaries

Locations where most volcanoes are found due to interactions between large plates of the Earth's crust.

Divergent Boundaries

Areas where tectonic plates move apart, allowing magma to rise and create new crust.

Convergent Boundaries

Locations where tectonic plates collide, leading to subduction and volcanic activity.

Hotspots

Volcanic regions located away from plate boundaries where hot mantle material rises to create volcanoes.

Mid-Ocean Ridges

Underwater volcanic mountain ranges formed by the upwelling of magma at divergent plate boundaries.

Continental Rift Zones

Areas within continents where the Earth's crust is being pulled apart, leading to volcanic activity.

Intraplate Volcanism

Volcanic activity that occurs within tectonic plates due to localized heat sources in the mantle.