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

[Q]: A volcano chain is formed by subduction of oceanic crust beneath a continental or oceanic plate.
[A]: What kind of chain is formed by subduction of oceanic crust beneath a continental or oceanic plate?

[Q]: Proteins are long chains of amino acids.
[A]: What are long chains of amino acids?

[Q]: Weight is the term for the measure of the force of gravity pulling down on an object.
[A]:
What is the term for the measure of the force of gravity pulling down on an object?