bits of crushed rock propelled from an erupting volcano

bits of ash and lava

the funnel-shaped mound of a volcano

the bowl shape at the top of a main vent through which lava flows

mud and rock fragments that surge down a mountain when part of it collapses

a spring that periodically blows steam and hot water into the air

a volcano that occurs where pools of intensely hot magma rises toward the surface, melting rock until it breaks through the crust

water that rises to the earth's surface as it is heated by a magma pool

rock formed as magma and lava harden

magma that has broken through the surface of the earth

Molten rock and gases beneath the earth's surface

pockets of molten rock deep in the earth's lithosphere

a hot spring that has more mud than water

An avalanche of red-hot dust and gases that races down the sides of some volcanoes.

a ring of volcanoes found in an area around the Pacific Ocean

a mixture of cinder, ash, and rock

the opening in the surface of the earth through which lava flows

volcanic fog or gases

a crack in the earth's crust through which molten rock come to the surface

a scientist who studies volcanoes