A bow is drawn so that it has 40 J of potential energy. When fired, the arrow will ideally have a kinetic energy of
A) less than 40 J.
B) more than 40 J.
C) 40 J.
C
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A census area based on commuting patterns is called a
A) Metropolitan Statistical Area. B) Micropolitan Statistical Area. C) Core-based Statistical Area. D) Combines Statistical Area. E) Primary Statistical Area.
What region is the least threatened by desertification?
A) Africa B) Asia C) Australia D) Europe E) North America
Judge the following sentence according to the criteria given below: The United States opposed the 1982 Law of the Sea treaty BECAUSE of concerns that sea floor mining would pollute the ocean
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.
In general, which of the statements below best describes what happens in terms of composition as crystallization proceeds down the Bowen's reaction series (shown in the figure)?
A) The early-formed silicates are enriched in iron and magnesium, resulting in such rocks as andesite and granite. As crystallization proceeds, the later-formed silicates are enriched in sodium, potassium, and silicon, resulting in and basalt. B) The early-formed carbonates are enriched in calcium and carbonate, resulting in such rocks as limestone. As crystallization proceeds, the later-formed carbonates are enriched in fossils, resulting in fossiliferous limestone and coquina. C) The early-formed silicates are enriched in iron and magnesium, resulting in such rocks as peridotite and basalt. As crystallization proceeds, the later-formed silicates are enriched in sodium, potassium, and silicon, resulting in andesite and granite. D) The early-formed silicates are enriched in sodium, potassium, and silicon, resulting in such rocks as peridotite and basalt. As crystallization proceeds, the later-formed silicates are enriched in iron and magnesium, resulting in andesite and granite.