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29 Cards in this Set

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the mountain-shaped structure
CONE
a small pit or depression at the top of the cone
CRATER
a channel through which lava flows from the magma chamber to the surface
VENT
a channel that branches off the vent
SECONDARY VENT
source of magma below a volcano
MAGMA CHAMBER
a crack in the Earth's surface through which magma rises
FISSURE
molten rock below the surface
MAGMA
molten rock at the surface
LAVA
rocks formed from molten rock
IGNEOUS
rocks formed from cooled magma
INTRUSIVE IGNEOUS
rocks formed from cooled lava
EXTRUSIVE IGNEOUS
examples of extrusive igneous rocks
PUMICE, OBSIDIAN, BASALT
examples of intrusive igneous rocks
GRANITE, GABBRO
magma high in silica and gases
RHYOLITIC
magma low in silica and gases
BASALTIC
magma with medium levels of silica and gas
ANDESITIC
a large mass of intrusive igneous rocks
PLUTON
the largest pluton
BATHOLITH
a very large pluton, slightly smaller than a batholith
STOCK
a mushroom-shaped pluton
LACCOLITH
a ribbon-like pluton forming horizontally
SILL
a ribbon-like pluton forming vertically
DIKE
any material ejected from a volcano
TEPHRA
hot, fast moving ejected material
PYROCLASTIC FLOW
a volcanic mudflow
LAHAR
smallest tephra
DUST
tephra the size of grains of sand
ASH
largest tephra
VOLCANIC BLOCK
lava cools and hardens in the air
LAVA BOMB