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

Q: At a convergent plate boundary, when one plate is oceanic, there are large volcanoes.

A: At a convergent plate boundary, when one plate is oceanic, there are large what?
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Q: Skeletal muscles must work in pairs to move bones back and forth at a joint because they can only contract.

A: Skeletal muscles must work in pairs to move bones back and forth at a joint because they can only do what?
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Q: Megapascals is the measure of water potential.

A:
What is the measure of water potential?
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