seismis waves that move along the earths surface and produce motion mostly in the upper few km of earths crust
a tracing of earthquake motion that is created by a seismograph
the point on earth surface directly above an earthquakes starting point or focus
the point along fault at which the first motion of an earhtquake occurs
the study of earthquakes
a wave of energy that travels through the earths away from an earthquake in all directions
a seismic wave that causes particles of rock to move in a back and forth direction
a seismic wave that causes particles of rock to move in a side to side direction
an instrument the records vibrations in the ground and determines the location and strength of an earthquake
a vent or fissure in the earths surface through which magma and gases are expelled
molten rock below the ground
molten rock above the ground
area at a divergent boundary where cracks form
a volcanically active area of earths surface far from a tectonic plate boundary
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?
what is the earths crust covered with that grind past each other?
What lies like a time bomb under San Fransisco?
The san andreas fault
What happened in October 1989 during the baseball playoffs?
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?
The sinking plates release super hot fluids which melt what layer above it?
As the volcano erupts does the island Grow or Sink?