Analysts vary as to their opinion of which factor is the more serious threat to the Earth's life support systems: ____________________ or ____________________
Fill in the blank with correct words.
overconsumption, overpopulation
overpopulation, overconsumption
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A geosynchronous communication satellite hovers above the same point on Earth's equator indefinitely because
A. its orbital period is 24 hours. B. it is beyond the main pull of Earth gravity. C. it is kept aloft by ground control. D. forces other than Earth's gravity act on it.
The phenomenon of desert expansion along the margins of semiarid and arid lands is known as
A) deflation. B) desertification. C) erosion. D) permeability.
In a phenol, which group is the substituent on the benzene ring?
A) amino B) carbonyl C) carboxyl D) hydroxyl
Which of the following is an example of a polycarbonate?
A) Lexan B) nylon-66 C) polystyrene D) poly(ethylene terephthalate)