Earthquake waves, including primary waves, secondary waves, and surface waves
SEISMIC WAVES
SURFACE WAVES
RICHTER SCALE
PYROCLASTIC FLOW
Molten rocks flowing onto Earth's surface
LAVA
Fracture that occurs when rocks break and that results in relative movement of opposing sides; can form as a result of compression(reverse fault), being pulled apart(normal fault), or shear(strike- slip fault)
FAULT
Powerful seismic sea wave that begins over an ocean- floor
TSUNAMI
Rigid layer of Earth about 100km thick made of the crust and a part of the upper mantle
