If the concentration of gold in seawater is 2.0 milligram per ton of sea water and the mass of the ocean is 1.5 × 1018 tons, how much gold is in the ocean?
A) 3.0 × 1012 kg
B) 3.0 kg
C) 300 g
D) 36 mg
E) 3,000 lb
A
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Height maps for the United States:
A) are updated twice a week. B) correspond to different approximate elevation levels. C) are done for 500 mb only. D) have little practical application in weather forecasting.
What, according to Kai Erikson, describes a “city of comrades”?
a. When community struggles to reunite post-disaster b. When there is renewed social solidarity that results after a disaster has subsided c. When the community itself feels betrayed d. When community becomes soiled and ruined
A rock with only 25% of the parent isotope left has been decaying for time equal to ________ half-lives.
A. five B. four C. one D. three E. two
The temperature of a red giant increases rapidly because ________
A) fusion increases and gives off heat B) endothermic chemical reactions occur C) exothermic chemical reactions occur D) friction from the collapse creates heat E) gravitational energy is converted to heat