1. Location (latitude) on the Earth where the Sun on a particular day is directly overhead (90° from horizon) at solar noon?

2. Term used to describe the stream channel pattern that is completely random?

3. One of three distinct processes involved in erosion?

4. Cell that contains two sets of chromosomes?

5. Area of low atmospheric pressure and calm westerly winds located at the equator?

6. Topographic border between adjacent drainage basins or watersheds?

7. The transport of gases and minute liquid and solid particles from the atmosphere to the ground surface without the aid of precipitation or fog?

8. Conversion of nitrates into gaseous nitrogen and nitrous oxide?

9. Six-sided microscopic particle that allows for deposition of water as ice crystals in the atmosphere?

10. Isotope of hydrogen, with a nucleus containing one proton and one neutron, and an atomic mass number of 2?