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

Ex Input:
Compression zones is the opposite of rarefaction zones, where air molecules in waves are loosely packed.

Ex Output:
What is the opposite of rarefaction zones, where air molecules in waves are loosely packed?

Ex Input:
Soft of these best describes the way a feather feels.

Ex Output:
Which of these BEST describes the way a feather feels?

Ex Input:
El nino is the cause of rising surface temperatures of the pacific ocean, drought in the western united states, and flooding on the pacific coast of south america.

Ex Output:
What is the cause of rising surface temperatures of the Pacific Ocean, drought in the western United States, and flooding on the Pacific coast of South America?