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1. In addition to possibly harmful chemicals in the environment, mining is considered?
A. The most dangerous job in the United States.
B. The least lucrative job in the United States.
C. The least dangerous job in the United States.
D. The most lucrative job in the United States.

2. What is the most abundant fossil fuel?
A. Gas.
B. Oil.
C. Wood.
D. Coal

3. Geologist Jame Hutton argues that the geologic processes occurring today have occurred since the formation of Earth. This idea is known as?
A. Uniformitarianism
B. Principle of inclusions.
C. Original horizontality.
D. Superposition.

4.the principle that states the undisturbed rock sequence has the oldest rocks on the bottom is known as?
A. Original juxtaposition.
B. Superposition.
C. Relative age dating.
D. Original parallelism.

5. Scientists can determine if oxygen existed in Earth's Archean atmosphere by?
A. Determining the lack of oxidation that occurred.
B. Looking at the amount of salt content in rocks.
C. Looking for oxidized iron in rocks.
D. Determine how many people survived.