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13 terms

science 8-9 study guide

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seismology
the study of earthquakes.
elastic rebound
is the sudden return of elastically deformed rock into its original shape.
seismographs
instruments located at or near the surface of the earth that records semsic waves
epicenter
the point on the earths surface directly above an earthquakes starting point
focus
the point inside the earth where an earthquake begins
S waves
are the second fastest semsic wave
lava
is magma that flows onto the earths surface.
pyroclastic material
of the rock fragments created by explosive volcanic material.
pillow lava
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.