The greatest human impact on the carbon cycle has been through ________
A) use of synthetic fertilizers
B) increased respiration of the exponentially growing human population
C) mining of limestone (calcium carbonate)
D) combustion of fossil fuels
E) depletion of aquifers
D
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What would the concentration of OH- be if the concentration of H3O+ was 1 × 10-5M?[H3O+] × [OH-] = Kw = 1 × 10-14
A. 1 × 105 B. 1 × 10-5 C. 1 × 10-14 D. 1 × 10-9 E. 1 × 109
If the pH of a solution is 10, what is the hydronium ion concentration?
A. 1 × 1010 M B. ?1 × 1010 M C. 10 M D. ?10 M E. 1 × 10-10 M
What does a total fertility rate of 2.1 indicate?
A) infant mortality rate B) rate of natural increase (RNI) C) crude birthrate (CBR) D) life expectancy E) total fertility rate (TFR)
A continent has an oceanic trench offshore of its coast. Which of the following is probably NOT present along this side of the continent?
A. a mountain belt B. volcanoes C. earthquakes D. subduction of an oceanic plate E. melting along a mid-ocean ridge