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Sediments are classified according to the source of their constituents into two main groups. One is chemical. What is the other?

Geology’s best tool for establishing absolute geologic time is

The study of minerals is called

The foundation of the science of geology rests on James Hutton’s theory of __________, which states that the present is the key to the past and provides the basis for the rock cycle model, a series of events through which rocks change over time.

Which occurrence is associated with the demise of the dinosaurs?

The sedimentary rock known as ______________ consists of angular pebbles cemented together by silica, calcium carbonate, or iron oxide.

Starting with a sample of pure parent radionuclide, what would be the ratio of the parent radionuclide to its daughter after one half-life has elapsed?

The scientific method begins when natural phenomena are ___________ and questions arise about how or why these phenomena occur.

An example of a sedimentary rock is

Which of the following is not a feature of a good index fossil?