Fact: The Arctic latitudes are warming, which has released methane (a greenhouse gas) from thawing Arctic permafrost. This has increased the rate of warming in the Arctic. Systems analysis would label this as ________
A) an open system
B) a closed system
C) a negative feedback loop
D) a positive feedback loop
E) an equilibrium condition
Answer: D
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How many valence electrons does bromine (Br, atomic no. = 35) have?
A. 28 B. 1 C. 35 D. 21 E. 7
Most job layoffs occur as a result of
A. Import competition B. Seasonal work C. Contract cancellation D. Bankruptcy E. Material shortages
Given the following generic chemical reaction, which is the reactant? X ? Y
A) Y is the reactant. B) X is the reactant. C) ? is the reactant. D) Both X and Y are the products. E) Both X and Y are the reactants.
Earth's surface receives about twice as much energy from the atmosphere than from the sun as a result of ____
A) the release of latent heat during condensation B) conduction of heat upward from the surface C) convection D) absorbed infrared energy radiated back to Earth E) direct absorption of sunlight by the atmosphere