Which greenhouse gas is most abundant naturally?
A) nitrous oxide
B) methane
C) water vapor
D) carbon dioxide
E) trace gases
C
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Regularly providing food to regions with chronic hunger in developing countries can aggravate the problem of food supplies by
A) changing the types of native foods consumed by the local people. B) causing nutritional deficiencies associated with a new type of food. C) causing overnourishment and the health problems associated with obesity. D) decreasing the local production of food and disrupting the local economy.
Most rock outcrops (about 75% of the total) are ________
A) igneous B) sedimentary C) metamorphic D) fossil-bearing
During the dissipating stage of a thunderstorm, the downdraft is stronger than the updraft
Indicate whether the statement is true or false
At sea level, the pressure of the atmosphere is about ________ kg/cm2, or ________ ln/in2
A) 1.0; 14.7 B) 2.6; 9.4 C) 8.2; 3.3 D) 6.7; 19.9