Converting plant sugars into simple sugars creates which biofuel?
A. ethanol
B. methane
C. propane
D. ethane
E. butane
Answer: A
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Which component of Earth's heat budgetaccounts for more than half of the incoming solar radiation on an average
day? a. cloud reflection b. water and land reflection c. cloud absorption d. water vapor and dust absorption e. water and land absorption
What unifying theory of geology holds that large segments of Earth's outer part move relative to one another?
A)lithospheric zone theory B)convection cell theory C)subduction zone theory D)plate cycle theory E)plate tectonic theory
The 1994 Cairo Conference on Population and Development found that the greatest threats to the health of the environment were
A) poverty, development, and population growth. B) education and the overuse of modern medicine. C) agriculture and surface mining operations. D) trends toward urbanization.
The theory of continental drift was initially rejected by many scientists because
A. the earth was considered to be too young for the continents to have moved any appreciable distance. B. few scientists believed it possible for the continents to move over a solid earth. C. there was overwhelming evidence against it. D. the positions of the continents on ancient maps were the same as on modern maps.