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. You expect to measure about 12.5% of the original radioactive isotope.

Indicate whether the statement is true or false.


Answer: False.

Environmental & Atmospheric Sciences

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Most countries adopt a/an ________ immigration policy that excludes unwanted migrants and includes more desired ones

A) selective B) discriminative C) inclusive D) bifocated E) stepped

Environmental & Atmospheric Sciences

In what way can human practices contribute to desertification?

A) overgrazing by livestock B) growth of too much crop cover C) growth of trees D) irrigation with rainwater

Environmental & Atmospheric Sciences

Why might the era we live in today one day be called the "Anthropocene"?

A. Because humans are the dominant life form on Earth at present. B. Because humans are causing significant changes to the planet. C. Because humans population is increasing rapidly.

Environmental & Atmospheric Sciences

The petroleum window is the depth between ________ to ________ feet through which sapropel must pass to transform into oil.

A. 100; 600 B. 10,000; 20,000 C. 500; 6000 D. 100; 1000 E. 7,500; 15,000

Environmental & Atmospheric Sciences