Which of the following explains how fog is a problem to aviation?
A. visibility drops
B. visibility increases
C. temperature increases
D. temperature decreases
Answer: A
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Why wouldn't you use carbon-14 dating on a piece of shell that was estimated to be 1 million years old?
A. Sea shells do not have radioisotopes. B. Uranium dating is better for items older than 1/2 million years. C. Carbon dating is only useful on plants. D. The amount of radioactive carbon in the sample would probably too small to measure. E. Carbon dating can only be used on items that were once alive.
Fragments of a rock that are contained in a layer of another rock must be ____________________ in
age than the layer of rock that surrounds them. Fill in the blank(s) with the appropriate word(s).
Indonesia, Malaysia and Brunei export their oil mainly to what country?
A) China B) Australia C) Japan D) New Zealand E) Vietnam
A country's ecological footprint is calculated from all but which of the following?
A) size of the population B) the education of the population C) the affluence of the population — calculated in terms of how much they consume D) the technologies being used — measured in term of the intensity of resource use E) both the size of the population and the education of the population.