1. Rain with a pH less than 5.6?

2. A sudden acidification of runoff waters from the spring melting of accumulated snow in the middle latitudes because of the winter deposition of acidic precipitation?

3. Group of filamentous microorganisms that are intermediate between bacteria and fungi?

4. Is the amount of water that is actually removed from a surface due to the processes of evaporation and transpiration?

5. Upper zone of soil in higher latitude locations that experiences daily and seasonal freeze-thaw cycles?

6. Form of remote sensing where the sensor provides its own source of electromagnetic radiation to illuminate the object understudy?

7. A process in which heat does not enter or leave a system?

8. Another term used to describe mixing ratio?

9. Change in an organism's physiology as a result of exposure to some environmental condition?

10. The evolution of a number of new species from one or a few ancestor species over many thousands or millions of years?