Question

1. On Earth, which of the following is in radiation balance? A. The entire atmosphere B. The surface at high northern latitudes (e.g., > 50° N latitude) C. The entire surface D. The entire Earth/Atmosphere system (measured at the boundary with outer space). E. All of the above 2. Which of the following can directly release a greenhouse gas to the atmosphere? A. Ammonium oxidation step of nitrification B. Denitrification C. Nitrogen fixation D. Ammonification E. Choices A & B are both correct. is scattered back to space by anthropogenic sulfate aerosols? A. The Stephan-Boltzmann Law B. Plancks Law C. Beers Law D. Weins Displacement Law E. The Inverse-Square Law 4. Although phosphorus is abundant in soils, it is not highly available to living things on land because A. it is rapidly lost to the atmosphere as a gaseous compound B. it is rapidly leached and lost as dissolved phosphorus in runoff to the ocean C. it becomes tightly bound to oxides of iron and aluminum which forms insoluble compounds D. it contains a triple covalent bond that requires a special enzyme and a significant amount of energy to break E. it causes eutrophication in many freshwater lakes 5. A perturbation that reduces the extent of continental ice sheets will decrease example of a coupling between these two events. and is an A. albedo; positive B. albedo; negative C. global mean temperature; negative D. sea level; positive E sea level; negative

Answer 1

Answer for the following questions.

1) E

all of the above

2) B

Classic denitrification reaction releases Nitrous oxide

3) C

4) C

The oxides of iron and alluminium once bound to free phosphate can not be eassily solublized. It can only be done by the organic acids produced by the bacteria which resides in rhizosphere.

5)A