In the English system, the total force producing a magnetic field is the _____.

The north pole of a compass needle points in the direction of the south geographic pole.

Within a lightning bolt, current flows _____.

In the English system of measure, magnetic strength is measured in terms of _____.

Of the three basic classifications of magnetic materials, _______________ materials are either metal or nonmetal materials that cannot be magnetized.

Static electricity refers to electrons that _____ moving.

Copy machines operate on the principle of static electricity.

Below are several maps of an active hot spot and a series (chain) of associated extinct volcanoes. Using your knowledge of the theory of how hot spots operate, determine which diagram correctly shows the direction of relative plate motion. Note that arrows in the diagrams indicate the direction of plate movement.  

Most of the world’s earthquakes occur:

What kind of rocks are formed from the direct cooling of magma?