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

When a magnetic material’s molecules are all lined up, and increases in current flow no longer cause increases in magnetic field strength, the material has reached _____.

Earth contains magnetic poles.

Magnetic lines of force are referred to as _____.

Of the three basic classifications of magnetic materials, _______________ materials are metals that are most easily magnetized.

An electroscope can be used to determine the polarity of an electrostatic charge.

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

True or False. Silica tetrahedrons in orthosilicates (an isolated silicate structure) share two oxygen atoms with adjacent silica tetrahedrons:

The oldest eon of geologic time is:

The technology developed in the 1950’s that allowed for the bathymetric mapping of the sea floor is known as: