What is carbon-14 dating useful for in terms of age and type of sample? What will be an ideal response?
Carbon 14 has a half-life of 5,730 years when it decays to carbon 12. Its short half-life makes it useful
for specimens younger than 70,000 years, and it is generally used to date former living material.
Carbon 14 is useful in archeology and is crucial to understanding the events of the latter portion of the
Pleistocene Epoch.
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Compressional stresses during continental collision can cause: __.
a. Crustal thickening and tectonic foliation b. Fold-thrust belt c. High-grade metamorphism d. All of the above e. Both a and b
Which of the following is NOT one of the four dominant language families for the Russian region?
a. Slavic b. Caucasian c. Turkic d. Ket e. Altaic
Success for sustainable development depends on progress in five areas, one of which being ________
A) the scientific method B) improved ability to monitor and forecast long-term trends C) discovering more non-renewable resources D) improving the effectiveness of offshore fishing vessels E) increasing human fertility
Which of the following statements is not true?
A. Except for those living near nuclear plants or uranium mines we are not normally exposed to radiation. B. A given radioisotope behaves chemically just like non-radioactive isotopes of the same element. C. Inferences about the effects of low doses of radiation are drawn, in part, by extrapolation from incidents of high dosage. D. Some radioisotopes are also chemical toxins.