Questions 1
allows molten rock and hot gases to escape from within the earth
volcano
a volcano that has erupted recently
active
earthquakes sometimes cause massive waves called _______.
tsunamis
scientists who study the structure of the earth
geologists
magma that has reached the earth's surface
lava
the strength of an earthquake
magnitude
a volcano that has not erupted in recorded history
extinct
any trembling or shaking of the earth's crust
earthquake
the underwater mountain ranges
mid-oceanic ridges
a depression found at the top of a volcano
crater
the temperature of rocks ______ with depth
increases
a volcano that produces lava fountains or fire curtains
the point underground where an earthquake begins
focus
the study of earthquakes
seismology
running along the edge of the Pacific Ocean, this is named for its many volcanoes
Ring of Fire
created when trapped gases blast through the earth's surface
a volcano that has been active at some time in recorded history, but has not had a recent eruption
dormant
a break that appears at the boundary between two moving masses of rock
fault
the process by which new soil is formed as rocks crumble and break into smaller pieces
weathering
smaller fragments of molten rock that solidify almost instantly
tephra
occurs when natural acids slowly eat into a rock, breaking it apart
chemical weathering
a volcano characterized by hot clouds of gas and dust that it expels
Plinian
the place at ground level that is directly above the focus of an earthquake
epicenter
the boundary between the earth's crust and its mantle
Moho
holes or cracks which serve as escape vents for underground gases
fumaroles