Dr. James Hansen of NASA has stated that we should set a goal of keeping CO2 levels below 350 ppm. Which year did we first exceed that level? If we decreased CO2 levels at the same rate that we have increased them over the past 10 years, how long would it take until CO2 levels were again below 350 ppm?
What will be an ideal response?
We exceeded 350 ppm in 1987. We could see 350 ppm in 21 years if we reduced levels by 6.4% every 10 years.
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The three-cell model for general circulation:
A) includes a segment called the Hadley Cell. B) is a better representation of the atmosphere than the single-cell model. C) accounts for the positioning of the Polar and Subtropical jet streams. D) takes in to account the spin of the earth. E) all of the above
Approximately how much energy is released by the hydrolysis of one mole of AMP?
A) 3.4 kcal B) 7.3 kcal C) 10.7 kcal D) 18 kcal
The first law of thermodynamics states that ____
a. energy can only be released from a system through the process of oxidation b. energy can be created, destroyed, or change forms c. energy cannot be created or destroyed; it can only change forms d. energy stored in a biomass decreases with each successive trophic level e. energy stored in a biomass increases with each successive trophic level
Salt wedging is most closely associated with ________
A) chemical weathering B) humid climates C) freeze/thaw cycles D) capillary action E) plant roots