lesson 1
Earthquake
the vibrations in the ground that results from movement along breaks in Earths lithosphere.
primary wave
P-waves cause particles in the ground to move in push-pull motion similar to a coiled spring.
Seismogram
graphical illustration of seismic waves.
Shield volcano
large with gentle slopes
fault
A break in Earths lithosphere where one block of rocks moves toward away from or past another
Secondary wave
S-waves, slower than P-waves, they cause particles to move up and down at right angels relative to the direction the wave travels
Volcano
A vent in Earths curst through which melted rock flows.
Composite volcano
large steep sided
seismic wave
Energy that travels as vibrations on and in Earth
Surface wave
cause particles inthe ground to move up and down
Magma
Molten rock below Earth's surface is called
Cinder cone
small steep sided
focus
Waves that originate where rocks first move along the fault at a location inside earth.
Seismologist
Scientist that study earthquakes
lava
Molten rock that erupts onto earth's surface
Volcanic ash
tiny particles of pulverized volcanic rock and glass
epicenter
The location on earths surface directly above the earthquakes focus.
Seismometer
Measure and records ground motion and can be used to determine the distance seismic waves travel.
Hot spot
Volcanoes that are not associated with plate boundaries.
Viscosity
a liquids resitance to flow