Water Cycle

.     Briefly explain the movement of water in, and basic phase changes of, the hydrologic cycle.

2. What are condensation nuclei and why are they important in our atmosphere?

3. In a volume of air, how does the actual vapor pressure differ from the saturation vapor pressure? When are they the same?

4. What does saturation vapor pressure primarily depend upon?

5. What does the relative humidity represent?

6. Why do hot and humid summer days usually feel hotter than hot and dry summer days?

7. What is the dew-point temperature?

8. Explain how dew, frozen dew, and visible frost form.

9. List the two primary ways in which fog forms.

• radiation fog

(b)  advection fog

10. For cloud formation, two things are required. Saturation, and Condensation Nucleii.  Explain how both lead to clouds.