Given scientific fact as input, generate the question from this fact such that it can be answered from the input.

Ex Input:
The sun delivers power to the chemical factory chloroplasts.

Ex Output:
What delivers power to the chemical factory chloroplasts?


Ex Input:
Gravity makes soil and rock particles move gradually down the slope during each thaw.

Ex Output:
What makes soil and rock particles move gradually down the slope during each thaw?


Ex Input:
Gradual degradation of a material due to its exposure to the environment is known as corrosion.

Ex Output:

Gradual degradation of a material due to its exposure to the environment is known as what?