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.Which of the earth system scientist's roles is best illustrated in this paragraph?
A. Ensuring the future of human life
B. Use of earth resources
C. Alerting public of natural hazards
D. Informing society
Answer: A
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Which of the following does not characterize frontier science?
a. It often captures news headlines because it is controversial. b. It may deal with preliminary data. c. It may eventually be validated. d. Scientists always agree on the meaning and accuracy of the data involved. e. It may eventually be discredited.
In which of the following countries did the polar front theory of a developing wave cyclone originate?
A. Great Britain B. Germany C. United States D. Norway
Ecologists have learned that succession is influenced by many factors other than climate alone including
A. invasive species, human land use history, and seed dispersal. B. biogeochemical cycles, available oxygen, and superfund sites. C. slope, wind patterns, and toxicity levels. D. the evolution of new species.
Glacial deposits gave strong evidence of the existence of Gondwana because ____.
a. a single continent in high latitudes was more sensible than low latitude glaciation on several continents b. glacial striations showed that all glaciers on each continent had flowed from a central location c. fossil plants indicated tropical climate in the northern continents d. a single continent in high latitudes was more sensible than low latitude glaciation on several continents AND glacial striations showed that all glaciers on each continent had flowed from a central location e. a single continent in high latitudes was more sensible than low latitude glaciation on several continents AND fossil plants indicated tropical climate in the northern continents