Given a scientific passage and an answer, generate a question for the given answer.

[Q]: Passage: Dissolved substances have a higher entropy value than their corresponding precipitate. Answer: entropy
[A]: What value of dissolved substances is higher than that of their corresponding precipitate?

[Q]: Passage: Sources of voltage include electric generators and cells. Electric generators change kinetic energy to electrical energy. Chemical cells change chemical energy to electrical energy, and solar cells change solar energy to electrical energy. Answer: electrical
[A]: Electric generators change kinetic energy to what type of energy?

[Q]: Passage: Why does it snow instead of rain? Air temperature determines which type of precipitation falls. Rain falls if the air temperature is above freezing (0 C or 32 F). Frozen precipitation falls if the air or ground is below freezing. Frozen precipitation may fall as snow , sleet , or freezing rain . Below, you can see how the different types form ( Figure below ). Answer: air temperature
[A]:
What determines which type of precipitation falls in the atmosphere?