When examining the Keeling Curve in the accompanying graph, one notices a "zigzag" upward-moving curve. What do these small up and down movements indicate?
A) weather-related factors affecting CO2
B) seasonal cycles in CO2 concentrations
C) O2 versus CO2 concentrations
D) latitudinal differences in CO2 concentrations
E) uncertainty in the CO2 conditions
B
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Which of the following statements about catalysts is NOT true?
A. A catalyst alters the rate of a chemical reaction. B. A catalyst can be consumed in a reaction as long as it is regenerated. C. A catalyst does not change the energy of the reactants or the products. D. A catalyst can be used to speed up slow reactions. E. All of the above are true.
Sedimentary deposits formed by wind tend to be very ____________________ sorted. Fill in the blank(s) with the appropriate word(s)
Precipitation forms by the ice crystal process when: a. clouds contain both ice crystals and liquid droplets
b. the liquid droplets within a cloud are supercooled. c. cloud temperatures are below freezing. d. All of these choices.
All of the following are examples of quantitative data EXCEPT ________
A) the gender of the students in a class B) the exam scores for the students in a class C) the number of siblings that students have D) the amount of sleep normally gotten by the students in a class E) the cholesterol levels of the students in a class