Exam 23: The Earths Interior Revisited: Insights From Geophysics

The following picture is that of a gravity map of the United States.What do the dark grey regions mean in terms of the density of the material below?

What causes the velocity of a P-wave to slow down when it enters the outer core?

Why are magnetic anomalies of continental crust so much more complicated than those of oceanic crust?

Geophysics is the study of _________.

Earth's magnetic field is produced in the ___________.

You are studying the seismic data from Mars when you notice that there are no S-waves recorded from 130° through 180° on the opposite side of the planet.What does this information tell you about the interior of Mars?

In the following graph,why does the line for S-waves NOT appear in the outer core?

The picture below shows a seismic tomography image of the western United States.What is the relative temperature of the blue regions (darker grey regions not outlined in black)versus the red regions (darker grey regions outlined in black)?

If a seismic wave is refracted upward at a boundary,what can be said about the material the wave is traveling through?

Earth's gravity is best represented by an equipotential surface that contains bumps and depressions where areas of more or less gravity appear over the Earth,this representation is called the _________.

S-waves travel ________ than P-waves; however,unlike P-waves,they _______ travel through liquids.

If an S-wave is traveling through rock when it encounters a magma chamber,the S-wave will ________________.

A positive magnetic anomaly is produced when the measured magnetic field strength is ___________ the expected magnetic field strength.

If a P-wave is traveling through sandstone and then encounters peridotite,the P-wave will ________________.

The core consists of two layers: the ______ inner core and ______ outer core.

Why would the gravity anomaly over a deep-ocean trench be negative?

A mountain range made of granite would produce a(n)_____________ gravity anomaly.

If a gravity anomaly is negative,what does that imply about the material underground?

If a ship towing a magnetometer passes over a piece of crust with a "normal" polarity,what will the magnetic anomaly look like?

In the seismic tomography cross section below,where is the subducting Juan de Fuca Plate,considering that the subducting plate is much cooler than the surrounding material?