The spectrum produced by a prism or a raindrop is evidence that the average speed of light in the material depends on the light's
a. transmission qualities.
b. color.
c. wave nature.
d. particle nature.

The correct answer for the question that is being presented above is this one: "B. color." The spectrum produced by a prism or a raindrop is evidence that the average speed of light in the material depends on the light's color. White light is being refracted into different colors.

The rocks expand when there hot/warm  and contract when they are cold.