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

Example Input: A volcano chain is formed by subduction of oceanic crust beneath a continental or oceanic plate.
Example Output: What kind of chain is formed by subduction of oceanic crust beneath a continental or oceanic plate?

Example Input: The cardiovascular system in the human body consists of the heart, a network of blood vessels, and blood.
Example Output: Which system in the human body consists of the heart, a network of blood vessels, and blood?

Example Input: If an elephant and a boy are falling towards the ground, both same time will land first.
Example Output:
If an elephant and a boy are falling towards the ground, who will land first?