Krypton-85 has a half-life of 10. years. Approximately what percentage of Kr-85 produced from nuclear testing in 1956 still remains radioactive today?
A) 25%
B) 12%
C) 6%
D) 3%
D
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You are hopping on boulders beside a quiet stream that runs through a V-shaped valley. How did the boulders get there? The boulders were likely
A. deposited along the stream bank by wind. B. carried in the stream then deposited at the stream bank. C. produced when chemical weathering broke up the rock along the sides of the valley. D. none of the above
Which of the following is an advantage of wind power?
A. Variable winds allow variable amounts of power generation. B. Wind turbines are attractive in scenic places, like off Cape Cod. C. It already provides a large percentage of the world's power requirements. D. It can be used nearly everywhere because all areas are windy enough. E. Wind power is renewable and can be used in remote locations.
This image shows the hypothetical planet in the investigation for the ocean interactions chapter. What type prevailing winds are most likely between 60° N and the North Pole?
A) Trade winds
B) Westerlies
C) Polar easterlies
D) No winds
Water politics, also called hydropolitics, is politics affected by the availability of water and water resources. In southwest Asia, this is particularly crucial in the relations between which set of countries?
A. Turkey, Syria and Iraq B. Turkey Lebanon and Israel C. Egypt, Libya and Sudan D. Iraq, Saudi Arabia and Iran