How far is a light year?
A. the distance of one Earth orbit
B. nearly 10 trillion km
C. 300,000 km
D. all of the above
Answer: B
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What is a problem with power generated by wind or sun?
A) It can create power surges that endanger the power grid. B) governments rarely give tax subsidies to renewable energy industries C) It results in extensive disruption of local power sources. D) Energy cannot be transferred from sunny or windy areas to other areas. E) It requires constant sun or wind.
When do tidal currents reach their maximum velocity?
a. Midway between slack water and high tide b. Midway between low tide and slack water c. Midway between high and low tide d. During the flood current e. During the ebb curr
What is the basic premise of the Core-Periphery relationship?
A) As the world economy expanded, it developed a core of less developed countries and a periphery of dominant, more developed countries. B) As the world economy expanded, a cycle developed wherein countries (such as Great Britain) spent about a century as the dominant power in the world economy, then lost its power and joined the periphery of less dominant economic powers. C) As the world economy expanded, a cycle developed wherein countries (such as the United States) spent about a century as a peripheral player in the world economy, then gained power and became a dominant economic power at the core of the world economy. D) As the world economy expanded, it developed a core of dominant, developed countries and a periphery of dominated less developed countries. E) As the world economy expanded, it developed a core of capitalist countries and a periphery of communist countries.
The relative age of a rock gives scientists a numerical date that the rock was formed.
a. true b. false