A supercluster is a
A) cluster of galactic clusters.
B) very large local cluster.
C) local cluster with at least 10,000 supergiant stars.
D) local cluster with at least 500 supermassive black holes.
A
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The countries with the largest reserves of natural gas are
a. Canada and the United States b. Russia, Iran, and Qatar c. Nigeria and Algeria d. India, Venezuela, and the United States e. Russia, Venezuela, and Canada
Resilience
What will be an ideal response?
A vibrating bob at the end of a vertical spring completes a cycle every 2 s. Its period is
A. 1 s. B. 0.5 s. C. 2 s. D. more than 2 s.
On human time scales, nonrenewable resources ____.
A. may be considered inexhaustible B. can never be recycled C. are replenished by natural processes within hours D. are used without ever becoming depleted E. can be depleted much faster than nature can form them