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The __________ theory states that the Earth’s lithosphere is made up of a series of solid sections or segments that are constantly interacting with one another in very slow motion.

The geologic time scale uses four time units to describe relative geologic time. From largest (longest) time unit to smallest (shortest), they are __________.

Solid, cohesive, natural aggregates of minerals are called __________.

Although they may have less total energy than some other types of storms, __________ are the most violent of storms.

The Richter scale for the severity of earthquakes has magnitudes expressed in whole numbers, usually between 3 and 9, but since it is a logarithmic scale, each whole-number step represents about __________ times more energy than the preceding whole-number step.

Rocks are classified based on __________.

The deflection of one lithospheric plate under another is called __________.

In which type of rocks would you expect to find fossils?

Any indication of prehistoric life preserved in rock is called

Alfred Wegener speculated that the present continents were once part of a single supercontinent that he named __________, which broke apart about 200 million years ago allowing its sections to somehow drift to their present positions.