A supercluster is a
A. local cluster with at least 10,000 supergiant stars.
B. very large local cluster.
C. cluster of galactic clusters.
D. local cluster with at least 500 supermassive black holes.
Answer: C
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Explain what the difference is between major climate zones and major biomes, and how the two interact
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Which of the following best describes the source of Earth's internal heat?
A. Internal friction & and heat generated by tidal forces. B. The sun and radioactive decay in Earth's interior. C. Internal friction and the sun. D. Internal friction and radioactive decay in Earth's interior. E. The sun and residual heat from the planet's formation.
Reserves, by definition, must be all of the following except
A. all rock types that are likely to host as yet undiscovered ore. B. exploitable with current technology. C. identified ore deposits. D. economically profitable to mine at present.
An influx of foreign workers into the United Arab Emirates has had what demographic impact?
A) a rise in birth rates B) it has created an extraordinary gender imbalance C) a decrease in birth rates D) a rise in the elderly population E) a rise in birth rates and an extraordinary gender imbalance