While only 2% of North Korea's land is in permanent crops, about a third of the population works in agriculture.
a. true
b. false
a. true
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Which of the following solutions can function as a buffer?
A) a solution containing HCl and NaCl B) a solution containing NaOH and NaCl C) a solution containing HC2H3O2 and NaC2H3O2 D) all of the above
The Little Ice Age that affected Europe from about ________ CE lowered average annual temperature by only about 1°C but was enough to reduce crop yields, cause mountain glaciers to advance, and produce winters much more severe than in the 20th century.
A. 1,200 to 1,400 B. 400 to 800 C. 1,400 to 1,900 D. 900 to 1,200 E. 1,900 to 2,100
Which of the following forms only over water?
A. funnel clouds B. hurricanes C. tornadoes D. thunderstorms
To indicate the air quality in a particular region, the EPA developed the____________________,which includes the pollutants carbon monoxide, sulfur dioxide, nitrogen dioxide, particulate matter, and ozone
Fill in the blank with correct word.