Hawaiian word used to describe a lava flow whose surface is broken
into rough angular fragments.
anno Domini, used to record the number of years after the death of Christ
a gray, fine-grained volcanic rock
A hard, dense, dark volcanic rock composed chiefly of plagioclase, pyroxene,
and olivine, and often having a glassy appearance.
Before Christ, used to record the number of years before the birth of Christ
Before Common Era; formally known as B.C.
Common Era; formally known as A.D.
cones (stratovolcanos): steep-sided, consist of layers of both pyroclastic
material and lava. Rocks comprising composite cones range from silica-poor varieties
(basalt) through intermediate types to silica-rich types,
ex: Cascade Range of California, Oregon, Washington, and British Columbia.
to come together from different directions
what's left of something destroyed
Change of shape by pressure or stress.
tending to move apart in different directions
A violent throwing out of flames, lava, etc., from a volcano
Invisible radiation wavelengths just below the color red in the electromagnetic
Internal heat of the earth.
a spot inside the mantle that heats areas of the plate
magma that reached the surface
A landslide or mudflow of volcanic remains
a mixture of finely divided solids with enough liquid to produce a pasty mass
The layer of the earth between the crust and the core; a solid body of rock
in between the molten core and thin crust at the surface.
with a smooth glassy surface.
One part of the earth's layers that moves constantly.
Pyroclastic: Composed chiefly of
rock fragments of volcanic origin
Cones (cinder cones): small, steep-sided, composed largely of pyroclasts
of various sizes with little, if any, lava., Occur in groups and are associated
either with major volcanoes in arcs or with isolated, local volcanic terranes,
ex: Wizard Island at Crater Lake; San Francisco Mountain volcanic field, Arizona
cones: low rounded profiles (2-10°), cone-shaped accumulations
of lava containing minor amounts of interlayered pyroclastic materials,
ex: Snake River Plain in western North America
A volcano made of changing layers of ash and lava.
When two plates meet and one slides beneath the other
Solid matter that is ejected into the air by an erupting volcano
An area of land
A very large ocean wave caused by an underwater earthquake or volcanic eruption.
thickness of a liquid (i.e. molasses)
small, steep-sided, shaped like inverted cups or domes, Formed by the intrusion,
extrusion, or both of thick (viscous) siliceous magma, typically associated
with major volcanoes, but can also occur in independent fields of intermediate
to siliceous volcanic structures that lack a single major volcano.
ex: Long Valley Caldera (Mono Lake area, California)
An opening in the earth's crust through which molten lava, ash, and gases are
A person who studies volcanoes
vapor: Water in a gaseous state, especially when diffused as a vapor
in the atmosphere and at a temperature below boiling point.
courtesy of Dictionary.com, science.ubc.ca