Red soil color is generally caused by:
a. aluminum compounds.
b. mercury compounds.
c. iron compounds.
d. clay.
C
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The Moon and Mercury lack ________.
A. minerals B. a crust. C. meteor impacts D. an atmosphere E. a core
With respect to making a shift from unsustainable lifestyles to sustainable lifestyles, it is estimated that we have about _____________years to accomplish this, but that it takes about _______________per cent of the population to bring about such
major social changes. a. 50 to 100; 50 to 100 b. 100 to 1,000; 5 to 10 c. 50 to 100; 5 to 10 d. 5 to 10; 50 to 100 e. 75; 75
The more than 100 nuclear power plants planned 30 to 40 years ago were never built in large part due to
A) increasing incidents of terrorism directed against nuclear plants. B) decreased demand for electricity and increased costs of safety features in construction. C) pressing demand for electricity, which required simpler coal-fired power plants that could be built faster. D) budget constraints stemming from the 2008 recession.
The Big Rock Mining company decides to build a mine shaft in South Africa that extends 3.5 km beneath Earth's surface. What approximate temperature would a person experience at the bottom of the mine shaft? (Hint: use the average accepted value for geothermal gradient.)
A. 88°C B. 25°C C. 110°C D. 75°C