In 2005 the United States Congress mandated that NASA find 90 percent of large Near Earth asteroids (NEAs)-those that have the potential to impact Earth-by the year 2020. This mandate was created in response to recent scientific data indicating large impact events were common in Earth's geologic past and therefore will likely occur again in the future. Many new NEAs have been discovered as a result of NASA's efforts and research is under way to find ways to stop such impact events from occurring.The above paragraph suggests that, unlike other natural hazards, asteroid impacts ________.
A. pose little threat to humans
B. are intensively studied by scientists
C. may some day be prevented
D. are not likely to occur in the near future
Answer: C
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A valid hypothesis must be capable of being proved
A. right beyond doubt. B. wrong. C. sort of right. D. by other investigators.
Some experts cite the failure to include the harmful environmental costs in the ____ of the goods and services as one of the major causes of the environmental problems we face.
A. stock prices B. indirect prices C. partial-cost prices D. market prices E. full-cost prices
Heat transfer by convection in the atmosphere is always downward, from air to ground
Indicate whether the statement is true or false
Mediterranean climates are prevalent in which part of North America?
A) On the lower slopes of low lying mountain ranges in the Atlantic Periphery region. B) In parts of the Coast Ranges where the normal lapse rate is dominant. C) Along the west coast in what is today known as the state of California. D) In parts of coastal Oregon where maritime air dominates in both summer and winter months.