____________ ____________ are catastrophic events in which a great many species die off simultaneously (in
geological terms). Fill in the blank(s) with the appropriate word(s).
Mass extinctions
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As shown in the Discussion Starter of this chapter, 23% of the 9.6 quadrillion Btu of renewable energy in 2014 came from wood and wood by-products and waste (e.g., sawdust and scraps). Estimate the number of cords of wood that would have the equivalent energy content. State your assumptions.
What will be an ideal response?
Religions differ in the attitudes that their teachings advocate toward women and
A) national laws often reflect those teachings. B) women are granted more freedoms as a result. C) increase availability of contraception. D) approve the ordination of women.
How does glacial ice form?
A) Frigid conditions cause direct freezing of atmospheric water vapor onto land surfaces. B) Melting snow accumulates in a basin and is refrozen as the climate cools. C) Sea ice becomes attached to land surfaces and develops into glacial ice. D) Snow is retained for many years and compacted into ice by overlying snow.
A recent change in the typical U.S. density gradient has been
A) the elimination of the gap traditionally found in the center. B) an increase in the extremes between the inner and outer areas. C) an increase in the number of people living in the center. D) a reduction in the differences in densities found within an urban area. E) an increase in the differences in densities found within an urban area.