The most abundant gases in Earth's present day atmosphere (by volume) are ____
A) carbon dioxide and nitrogen
B) oxygen and water vapor
C) nitrogen and oxygen
D) oxygen and helium
C
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A deposit of volcanic tuff contains the isotope potassium-40, which is slowly decaying into argon-40. How might the apparent age of the sample be affected if the volcanic tuff is heated and remains heated for a long period of time?
A) The rate of decay will speed up. B) The sample will appear older than it really is. C) The sample will appear younger than it really is. D) Heat will have no effect on the age of the sample.
Judge the following sentence according to the criteria given below: Areas of downwelling are associated with prolific marine life BECAUSE the necessary nutrients are continuously replenished
A) The assertion and the reason are both correct, and the reason is valid. B) The assertion and the reason are both correct, but the reason is invalid. C) The assertion is correct, but the reason is incorrect. D) The assertion is incorrect, but the reason is correct. E) Both the assertion and the reason are incorrect.
The shininess of metals is due to
A. loose electrons vibrating to the oscillations of any incident light. B. absorption of light. C. reflection of 100% of incident light. D. none of the above
Russian uses the Cyrillic alphabet due to the once close connection with the ________ empire
A) Mayan B) Persian C) Chinese D) Byzantine