Switching the United States to a smart electric grid would save the U.S. economy ____ per year over the next 20 years.
A. $5 million
B. $500 million
C. $2 billion
D. $500 billion
E. $2 trillion
Answer: E
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The crude death rate
A) is the sum total of infant mortality rate, youth mortality rate and the elderly mortality rate. B) typically declines as overall levels of economic development go up. C) is typically higher in core countries than in periphery countries. D) is not considered a useful measure by most population geographers.
The fronts, from top to bottom, are
A) occluded, stationary, warm, cold. B) stationary, occluded, cold, warm. C) cold, warm, stationary, occluded. D) cold, warm, occluded, stationary.
Which of the following statements is true regarding high or low pressure for a parcel of air at the surface?
A. lower temperature, higher density, cold air rises, higher pressure at surface B. lower temperature, higher density, cold air sinks, higher pressure at surface C. higher temperature, higher density, warmer air rises, lower pressure at surface D. higher temperature, lower density, warmer air rises, higher pressure at surface
Degenerate matter can have densities 1 million times greater than the density of water, and they achieve this density by ________
A) compressing all of the electrons so that they are close to the nucleus B) forming ions that bond electrostatically so that there volume is very small C) fusing all of their atoms into super atoms with very high atomic numbers D) converting the atomic nucleus to a small volume with high mass by expelling all neutrons