The air you breathe is 78% ________
A) oxygen B) carbon dioxide C) hydrogen D) nitrogen
D
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Which country, which has discouraged immigration in the past, is now finding its economic future threatened due to the effects of a declining population?
A. India B. the Netherlands C. Japan D. Ethiopia E. China
A system of integrated waste management involves
A) landfills. B) recycling. C) composting. D) a combination of ways to handle MSW.
On this map of earthquakes near Japan, why do shallow earthquakes occur to the east and deeper earthquakes occur to the west?
A. The subduction zone dips to the west. B. The crust is hotter near Japan, closer to the volcanoes. C. The continental crust is thicker to the east. D. There is a continental collision to the east.
According to the Köppen system of classifying climates, which of the following letters designates dry climates?
A. climate A B. climate B C. climate C D. climate D