Earth's primitive atmosphere evolved from gases ________
A) from the Sun
B) collected from the nebula
C) produced by radioactive decay
D) expelled from within the earth
E) escaping from water
D
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What is a serious hazard to aircraft?
a. molecular viscosity b. laminar flow c. clear-air turbulence d. longwaves in the westerlies e. thermal lows
Which of the following is generally true of many suburbs in Europe, in contrast to U.S. models?
A) Shops, schools, and other services are worse than in central-city neighborhoods, and they are centers for crime, violence, and drug dealing. B) They have the best schools, although these same schools are centers for white-collar crime, hazing and other forms of student-on-student violence, and drug dealing. C) Most of the best shopping malls are located here. D) They tend to have the largest community gardens in Europe. E) They have the highest property taxes in Europe, and their levels of crime are low.
A mineral deposit can be classified as an ore deposit when
A. it contains valuable gemstone quality minerals. B. it contains valuable fossil fuels. C. valuable metals are present in the deposit. D. valuable metals in the deposit can be mined at a profit.
The __________ region of Africa is a broad belt of tropical steppe and savanna south of the Sahara
Fill in the blank(s) with correct word