1. Readjustment of the stream profile where the stream channel is lowered by the erosion of the stream bed?

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

3. Portion of the stream load that is in solution in the flowing water?

4. Downward movement of air in the atmosphere?

5. An extensive region covered by numerous sand dunes?

6. Any material deposited by a glacier?

7. Inference in which the conclusion about particulars follows necessarily from general theory?

8. Variable in a statistical test whose observation's values are thought to be controlled through cause and effect by another independent variable modeled in the test?

9. Area that receives low precipitation; percipatation being less than 25 centimeters a year?

10. Method for measuring the gradient of a slope?