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25 Cards in this Set

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earthquakes sometimes cause monstrous waves called
tsunamis
trembling or shaking of the earth's crust
earthquake
a break that appears at the boundary between two moving masses of rock
fault
the place at ground level that is directly above the focus of an earthquake
epicenter
point underground where an earthquake begins
focus
allows molten rock and hot gases to escape from within the earth
volcano
created when trapped gases blast through the earth's surface
vent
with depth the temperature of rocks
increases
occurs when natural acids slowly eat into a rock, breaking it apart
chemical weathering
the measurement of an earthquake's strength
magnitude
scientists who study the structure of the earth
geologists
the study of earthquakes
seismology
the processs by which new soil is formed as rocks crumble and break into smaller pieces
weathering
the boundary between the earth's crust and its mantle
Moho or Mohorovicic discontinuity
the underwater mountain ranges
mid-oceanic ridges
a volcano that has been active at some time in recorded history, but not recently
dormant
a volcano that produces lava fountains or fire curtains
Hawaiian
a volcano that has not erupted in recorded history
extinct
a volcano that has erupted recently
active
a volcano characterizied by hot clouds of gas and dust that it expels
Plinian
magma that has reached the earth's surface
lava
runs along the edge of the Pacific Ocean, named for its many volcanoes
Ring of Fire
a depression found at the top of a volcano
crater
holes or cracks which serve as escape vents for underground gases
fumaroles
smaller fragments of molten rock that solidify almost instantly are
tephra