Exam 2: Earths Interior and Geophysical Properties

The ____ is a low velocity seismic zone.

The magnetic poles are displaced about ______ degrees from the geographic poles.

The force of gravity between two objects decreases as the square of the distance between the objects increases.

The Earth's core is made up of equal parts cobalt and iron.

The rock record for tens of millions of years indicates that the Earth's magnetic field ____.

The ____ is the transition zone at the core-mantle boundary.

The greatest negative gravity anomalies in the world are found over oceanic trenches.

The composition of the upper mantle is the ultramafic rock peridotite.

A cavity or body of low-density material causes a _____ pull on a gravity meter relative to average crust.

Continental crust is ___ relative to oceanic crust.

The rise of the surface of the crust after removal of glacial ice is known as isostatic rebound.

The P-wave shadow zone can be explained by the refraction of P-waves at the ___.

A deviation from average reading is called a(n)____.

_____ is the branch of geology that applies physical laws and principles to study Earth.

A gravity meter can be used to explore for metallic mineral deposits.

A region of magnetic force,called the ______ surround Earth.

The presence of an S-wave shadow zone implies that the Earth's core is liquid.

The crust and upper mantle form the ____.

The average temperature increase in the shallow crust (the geothermal gradient)is about ______ degrees C per kilometer.

The gradual loss of heat through the Earth's surface is called ___.