The eccentricity of Earth's orbit
A) has been increasing.
B) changes cyclically on several scales.
C) is currently zero, meaning Earth has a circular orbit.
D) varies between 3 and 8 percent.
Answer: B
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Western Pakistan is dominated by languages of the ________ family
A) Tibeto-Burman B) European C) Austroasiatic D) Iranic
The Haber-Bosch process allows farmers to ________
A) apply synthetic phosphorus-rich fertilizers to their cropland B) circumvent regulations meant to protect waterways from nutrient pollution C) fertilize their cropland without having to worry about nutrients getting into waterways D) extract nitrogen from animal waste products for use as fertilizer E) apply synthetic nitrogen-rich fertilizers to their cropland
Undercutting action of the sea results in
A) sea terrace. B) sea cliffs. C) tombolos. D) lagoons. E) barrier splits.
Boundaries of biogeographic realms usually
A. based on current country delineation. B. arbitrary, demarcated by Alfred Wallace in the 19th century. C. based on locations of major high and low pressure zones. D. climatic and topographic barriers. E. follow the boundaries of biomes.