Exam 9: Earthquakes and Earth's Interior

The temperature range at the base of the crust is 1,000 to 1,500 degrees C.

Monitoring changes in electrical conductivity is a scientifically accepted method used to predict earthquakes.

Why are the paths of seismic waves curved?

The analysis of the alignment of the planets and moon is a scientifically accepted method used to predict earthquakes.

Only 5 percent of all earthquakes occur within ____.

Scientists use seismic tomography to

Seismic waves that cause a rolling or swaying motion of the surface of the ground are called ____________________.

The velocities of P- and S-waves are determined by these two properties of the material they are passing through: ____________________ and ____________________.

The average geothermal gradient near Earth's surface is what?

According to the elastic rebound theory,____.

Seattle,Washington ____.

Which type(s)of seismic waves do seismographs record?

What is Earth's average density,what are the average surface rock densities,and what does this tell us about the interior of Earth?

What is the evidence that Seattle is prone to earthquakes since there have been no quakes in historic times?

Why are most intermediate- to deep-focus earthquakes generated at convergent plate boundaries?

The two types of body waves are _______ and _______ waves.

The elastic rebound theory of earthquakes postulates that rocks store the energy of ____________________ by bending until their internal strength is surpassed and they ____________________ and return to their former place.

We know that the mantle is not molten because P-waves can travel through it.

The theory of elastic rebound was proposed as a result of studies following the ____________________ earthquake in the year ____________________.

The number of seismograph records needed to locate the epicenter of an earthquake is ______.