6. (foll by: to) related (to) or dependent (on). 7. (when: postpositive, often foll by to) having a subsidiary or minor relationship (with). 8. (General Physics) (esp of a beam of light or particles) arriving at or striking a surface: incident electrons.
Answers (1) hill. Personally, if you use salt water properly, it won't cause any damages to your sunglasses. But if you rinse your sunglasses in salt water for a long time, it may cause some damages to the lens coating of your sunglasses. Anyway, you needn't rinse your sunglasses in salt water.
When the glass is cold the water molecules strike the glass and cool off, becoming liquid. The water comes from the air. Air as it exists under normal conditions in the atmosphere contains some small fraction of water vapor. When the glass is cold the water molecules strike the glass and cool off, becoming liquid. The water comes from the air.