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23 terms

Earthquake and Volcanoes Quiz

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Surface waves
seismis waves that move along the earths surface and produce motion mostly in the upper few km of earths crust
seismogram
a tracing of earthquake motion that is created by a seismograph
epicenter
the point on earth surface directly above an earthquakes starting point or focus
focus
the point along fault at which the first motion of an earhtquake occurs
seismology
the study of earthquakes
seismic wave
a wave of energy that travels through the earths away from an earthquake in all directions
P wave
a seismic wave that causes particles of rock to move in a back and forth direction
S wave
a seismic wave that causes particles of rock to move in a side to side direction
seismograph
an instrument the records vibrations in the ground and determines the location and strength of an earthquake
volcano
a vent or fissure in the earths surface through which magma and gases are expelled
magma
molten rock below the ground
lava
molten rock above the ground
rift zone
area at a divergent boundary where cracks form
hot spot
a volcanically active area of earths surface far from a tectonic plate boundary
subduction
convergent boundary where a more dense tectonic plate dives under a less dense tectonic plate
What did volcanoes vent that formed the atmosphere and oceans?
Gases
what is the earths crust covered with that grind past each other?
Tectonic plates
What lies like a time bomb under San Fransisco?
The san andreas fault
What happened in October 1989 during the baseball playoffs?
Earthquake
What is the site of the greatest volcanic eruption in modern history?
Mount st. helen's
What is deep within the crater which is helping the mountain rebuild itself?
Lava dome
The sinking plates release super hot fluids which melt what layer above it?
The mantle
As the volcano erupts does the island Grow or Sink?
Grow