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What is the channel in a volcano through which gases and molton rock are ejected from the earth's interior
vent
This type of volcano will probably not erupt again
extinct
What is the fracture zone between stationary and moving rocks
fault
Super heated cloud of gas and small particles that travels as an avalanche
pyroclastic flow
lava in water solidifies almost instantly, forming round structures
pillow lava
What type of fold occurs when rocks buckle up to form an arch like structure
anticline
This type of volcano is formed partially by explosive eruptions of ash and rock fragments and partly by mild lava flows
composite volcano
What is the idea that rocks on either side of a fault spring to a position of little or no stress after an earthquake
elastic rebound
large irregularly shaped lump made of lava that hardened before being thrown out of the volcano
volcanic block
Hardened lava that forms rough jagged rocks with a crumbly texture
aa
What is a bowl shaped hollow formed by the collapse of an underground magna chamber
caldera
This type of volcano is inactive but could erupt again
dormant
What is the bottom of the mantle called
core mantle boundary
Hardened lava with a surface this is either smooth or ropy
pahoehoe
A mass of underground volcanic rock that is similar to a laccolith but much larger is
batholith
What major type of fault occurs when rocks on one side of the fault are shoved over the rocks on the other side
thrust fault
What is an underground channel that formed when surface lava hardened before the lava beneath it
lava tunnel
What is an opening in the earth's surface through which hot gases, ash, and molten rocks are ejected from the earth's interior
volcano
Solid ejecta larger than 2 mm but less that 64 mm in diameter
lapilli
The molten rock beneath the surface of the earth is
magma
This type of volcano consists primarily of erupted volcanic ash and rock fragments held loosely together
cinder cone volcano
What is a computer system that stores and processes geographic data from various sources
GIS
What is the boundary line between the crust and the mantle called
Moho
Solid particles less than 2 mm in diameter
volcanic ash
Smaller earthquakes that often follow a larger earthquake at a frequent intervals are called
aftershocks