What do computer models predict about how precipitation patterns will change in North America for the period 2090-2099, relative to the years 1980-1999?
A. North America will be wetter in both winter and summer.
B. North America will be drier in winter, but wetter in summer.
C. Precipitation patterns will not change significantly over this period of time.
D. North America will be wetter in winter, but drier in summer.
Answer: D
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Why do large regions of continental crust stand high above sea level?
A) ?The rigid asthenosphere allows the thicker continental crust to stand high above oceanic crust. B) ?Oceanic crust squeezes continental crust so that it continuously stands high above sea level. C) ?The continent's mountains float high above sea level because the lithosphere gradually sinks into the deformable asthenosphere until it has displaced a volume of asthenosphere equal to their mass. D) ?The uppermost mantle is thicker beneath continental crust than it is beneath oceanic crust allowing large regions of continental crust to stand high above sea level.
The Younger Dryas, the Medieval Climate Anomaly, and the Little Ice Age demonstrate that climates naturally fluctuate
Indicate whether the statement is true or false
Under U.S. immigration policies
A) refugees receive special priority over economic migrants. B) economic migrants are expedited across borders to ensure their skills contribute quickly to the economy. C) refugees and economic migrants are treated the same. D) economic migrants are allowed only if they don't send remittances. E) economic migrants are allowed only if they can prove there were no jobs available in their country of origin.
Too much or too little of any physical or chemical factor can prevent the growth of a population, even if all other factors are at or near the optimum conditions. What is this ecological principle?
A. tolerance B. limiting factor C. resilience D. persistence E. optimal level