science 8-9 study guide
the study of earthquakes.
is the sudden return of elastically deformed rock into its original shape.
instruments located at or near the surface of the earth that records semsic waves
the point on the earths surface directly above an earthquakes starting point
the point inside the earth where an earthquake begins
are the second fastest semsic wave
is magma that flows onto the earths surface.
of the rock fragments created by explosive volcanic material.
lava in the form of an agglomeration of rounded, pillow-shaped masses, the result of subaqueous or subglacial volcanic eruption.
where do earthquakes mostly occur
They are most likely to occur at tectonic plates
what is a seismograph
a tool that measures ground movement
list the 4 pyroclastic materials
volcanic blocks, volcanic bombs, lapilli, ash
what is a shield volcano
are layers of lava that over time create a volcano spreads over a wide area.