1. Another name for the ocean floor?

2. Slow adjustment of an organism to new conditions in its environment?

3. The growth of the continental masses over geologic time via the addition of marine sediments?

4. Surface addition of snow to a glacier or snowfield?

5. Region in a glacier where there is a surface net addition of snow?

6. Substance having a pH less than 7?

7. Atmospheric deposition of acids in solid or liquid form on the Earth's surface?

8. Any substance with a pH below 7?

9. Any water solution that is acidic with pH less than 7?

10. Rain with a pH less than 5.6?