During the most recent Ice Age, glaciers excavated deep valleys of Norway's Kjöllen Range as they cut their way to the sea. These valleys are known as:
A. estuaries
B. fjords
C. loess
D. the Black Triangle
B. fjords
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At the checkout counter, an environmentalist is most likely to say
a. "Plastic please" b. "Paper please" c. "I brought my own bag." d. "I want a cardboard box, please." e. "Either plastic or paper."
Which term represents the increase or relocation over time in the geographic area within which a language is spoken?
A. language dominance B. hierarchical diffusion C. language diffusion D. linguistic spread
Which of the following is a good example of a chemical that hazard to public health?
A) Immunizations may be the best defense against pandemic viral disease. B) In southern Florida, homes must be well constructed to resist severe hurricanes. C) Before the switch to unleaded gas, children living near highways had high lead exposure. D) Women who smoke and use birth control pills greatly increase their risk of developing heart disease.
Which of the following molecules is used by macrophages to kill pathogens?
A) NO B) NO2 C) N2O D) none of these