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Volcanoes

Science

Volcanoes Chapter Video

Volcanoes Chapter Video

batholith

a large rock mass that forms when magma cools inside Earth’s crust
batholith Simple Definition

caldera

a large, circular hole that forms when the top of a volcano collapses
caldera Simple Definition

cinder cone volcano

a steep, cone-shaped volcano, it is made of ash and cinders
cinder cone volcano Simple Definition

composite volcano

a tall, cone-shaped volcano, it is made of alternating layers of lava and ash
composite volcano Simple Definition

crater

a cup-like shape that forms at the vent of a volcano
crater Simple Definition

dike

a slab of volcanic rock formed when magma hardens across layers of rock
dike Simple Definition

fault-block mountain

mountains formed as blocks of rock move up or down along faults
fault-block mountain Simple Definition

geyser

a hot spring that periodically shoots water and steam into the air
geyser Simple Definition

hot spot

an area where magma melts through the crust above it
hot spot Simple Definition

lava

molten rock that reaches the Earth's surface
lava Simple Definition

magma

molten rock beneath the Earth's surface
magma Simple Definition

magma chamber

a large pocket of molten rock under a volcano
magma chamber Simple Definition

mountain

a tall landform that rises to a peak
mountain Simple Definition

pyroclastic flow

the fast-moving hot gases, ash, and cinders expelled from a volcano
pyroclastic flow Simple Definition

shield volcano

a wide, gently sloping mountain formed by lava from quiet eruptions
shield volcano Simple Definition

sill

igneous rock feature formed when magma squeezes between layers of rock
sill Simple Definition

vent

an opening in the ocean floor where water heated by magma below rises up through cracks
vent Simple Definition

viscosity

a fluid's resistance to flowing
viscosity Simple Definition

volcanic neck

hardened magma in a volcano’s pipe
volcanic neck Simple Definition

volcano

a mountain through which lava flows to Earth’s surface
volcano Simple Definition

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