earthquakes

A force that acts on rock change it's volume or shape

pulls on the crust stretching rock so it becomes thinner in the middle crust

squeezes rock until folds or break

stress that pushes a mass of rock into opposite directions

tension in earth crusts pulls rock apart causing normal faults

the block of rock that lies above

the rock below is called foot wall

has the same structure as a normal fault but moves together and uses compression

using sheering and slip side past each other

a fold in rock that bends into an arch

a fold in the rock that bends downward into a valley

is a a large area of land elevated above sea level

is shaking and trembling that results the movement of rock beneath earth's surface

is the area beneath the Earths surface where rock is under stress breaks and triggers an earthquake

the point on surface directly above the focus

the seismic waves that compress and expand the grounds

seismic waves that vibrate from side to side and up and down

move slow and produce severe ground movements

was developed to rate earthquakes damage

is a number that geoligists assign to the earthquake based on the earthquakes size

is a rating on earthquakes magnitude seismic waves

records and measures seismic waves

measures the energy released in an earthquake