| Describe the relationship between the rate of evaporation, crystal size, and number of crystals. | Refer to the illustration. |
| As the cooling rate is decreased, what happens to the size of the crystals?: | Refer to the illustration. |
| As the cooling rate is decreased, what happens to the number of crystals?
| Refer to the illustration. |
| Why did the melt in the smallest container turn completely into glass?
| HINT: What does cooling rate have to do with the formation of glass? What does the size of the container (volume of melt) have to do with cooling rate? |
| Why did glass form only near the wall region of the intermediate size container but not at its center?
| HINT: How does cooling rate vary with location in the container? |
| At the wall region in the largest container, why did only a very thin layer of glass form?
| HINT: What does cooling rate have to do with the formation of glass? What does the size of the container (volume of melt) have to do with cooling rate? |
| Describe and explain the variation in grain size from the center out to the wall region of the largest container.
| HINT: What does cooling rate have to do with grain size? |