Volcanos
Vent
Point on the earth's surface directly above where the earthquake begins
epicenter
Large, irregularly shaped lump made of lava that harden before being thrown out of the volcano
Volcanic block
Consists primarily of erupted volcanic ash and rock fragments held loosely together
Cinder-cone volcano
The study of the earth
Geology
The type of mountain that appears to have formed by the edges of two adjacent tectonic plates pushing together is a ______________
Folded
Earthquake waves can provide us with information about the the earth's
Interior
superheated cloud of gas and small particles that travels as an avalanche
Pyroclastic flow
Volcano that is inactive but can erupt again
dormant volcano
Central portion of the earth
Core
What is most likely to cause volcanic eruption to be violent?
large amount of dissolved gas
80% if world's earthquakes happen in the
Circum- Pacific belt
Solid ejecta larger than 2mm but less that 64mm in diameter
Lapilli
Volcano that will probably not erupt again
extinct
Inner core of the earth is thought to be
liquid
General name for mass of underground volcanic rock
igneous intrusion
An earthquake caused by sudden movements of rock beneath the earth's surface is a
tectonic earthquake
Solid particles less than 2mm in diameter
Volcanic ash
formed partly by explosive eruptions of ash and rock fragments and partly by mild lava flows
Composite volcano
The middle of the earth's 3 layers
mantle
Molten rock beneath the surface of the earth
magma
At what point deep in the earth does an earthquake begin
hypocenter
lava in water solidifies almost instantly, forming rounded structures
Pillow lava
What is an opening in the earth's surface through which hot gases, ash, molten rock are ejected from the earth's interior
Volcano
Most abundant element in the earth's crust
Oxygen