Which gas is the primary component of natural gas?
A. ethane
B. methane
C. propane
D. butane
E. hydrogen sulfide
Answer: B
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Fractured rock masses tend to weather more easily than massive monolithic ones of the same
composition. Indicate whether the statement is true or false.
The United Nations concept of sustainable development links what three goals?
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You are an archaeologist researching artifacts left behind by Francisco Pizzaro's conquest of Peru in the 1530s. In order to confirm the authenticity of the leather artifacts, you are performing radiometric dating using an isotope pair that has a half-life of 250 years. In order for the artifacts to date back to the time of Pizzaro's conquest, approximately how much original radioactive isotope must be left in the artifacts?
A) 50% B) 25% C) 75% D) 12.5%