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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?

The process of matching up rock layers in different localities by such means as index fossils is called

The four seasons-spring, summer, fall, and winter-are caused by the Sun’s changing its daily altitude over a period of 1 year. The Sun’s altitude changes because __________.

Earth’s thin, rocky, outer layer on which we live is called the

Which of the following is not generally used in mineral identification?

When an earthquake occurs, the point of initial energy release is called the earthquake’s ______________.