Frosty
A mountain that erupts hot lava, ash, and gasses.
Volcano
The bowl-shaped depression at the top of a volcano.
Crater
The sudden release of magma, ash, and gasses.
Eruption
Light, porous rock formed from frothy volcanic lava.
Pumice
A volcano that is temporarily inactive but may erupt again.
Dormant
A volcano that is currently erupting
Active Volcano
A volcano that is dead; it will not erupt again.
Extinct Volcano
Reservoir of molten rock beneath the Earth's surface.
Magma Chamber
A large depression formed when a volcano erupts and collapses.
Caldera
A tall, symmetrical volcano with alternating layers of lava and ash.
Composite Volcano
A small, steep-sided volcano built of ash and cinders.
Cinder Cone Volcano
Fine particles of pulverized rock expelled during an eruption.
Ash
The deposit of volcanic ash on the ground after an eruption.
Ashfall
The hot ash, lava, and fragments ejected from an explosive eruption.
Pyroclastic Flow
A broad, gently sloping volcano with fluid lava flows.
Shield Volcano
A ring of earthquakes and volcanoes that circle the Pacific Ocean.
The Ring of Fire
Volcanic glass formed by the rapid cooling of lava.
Obsidian
Rock fragments and particles ejected during a volcanic eruption.
Tephara
An opening in a volcano that emits steam and gases.
Fumarole
A volcano that occurs under water
Hot spot