Fig. 21. "With a silence deep and white."

Questions on a Snow Storm.

1. What causes snow?

2. At what temperature do snow crystals form?

3. How do the clouds appear before a snow storm?

4. What is the temperature of the air before the storm?

5. What is the direction of the wind before the storm?

6. Does the storm come from the same direction as the wind?

7. What are the conditions of the wind and temperature when the snow crystals are most perfect in form?

8. What are these conditions when the snow crystals are matted together in great flakes?