Recycled plastic from soda pop bottles are used to make cell phones; this is:
a. closed-loop recycling
b. preconsumer recycling
c. postconsumer recycling
d. secondary recycling
e. primary recycling
Answer: d. secondary recycling
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What was the primary reason that the beaver and songbird populations were also diminished from the area?
A) The wolf population was feeding on the beaver and songbirds. B) The rivers were full of sediment, making it difficult for beaver to swim and songbirds to drink water. C) The elk population was feeding on the beaver and songbirds. D) The temperatures in the area were warming, making it difficult for the beavers and songbirds to survive in warmer weather. E) The plants that the beaver and songbirds ate were diminishing, because of the elk's increased herbivore pressure.
In developing nations, such as India and Nigeria, ________
A) small numbers of people have moved into the cities B) rural people are moving to the cities in large numbers C) very little change has occurred in the past 40 years regarding where people live D) most of the population is moving to the suburbs from the city centers E) more people are moving to the suburbs than to the city centers
The Earth's magnetic field is generated by
A. convection currents in the asthenosphere. B. aligned magnetic minerals within Earth's inner core. C. salty water moving through the deep parts of the crust. D. movement of iron and electrical currents within Earth's outer core.
There is an ongoing dispute among Congress, the oil industry, environmentalists, and indigenous peoples about whether the oil reserves of northeastern Alaska's Arctic National Wildlife Refuge (ANWR) should be exploited. What are the arguments for and against developing this region?