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

[Q]: Plasma membranes encloses and defines the borders of cells.
[A]: What encloses and defines the borders of cells?


[Q]: The height of the wave is used to determine the magnitude of an earthquake.
[A]: What measurement of the wave is used to determine the magnitude of an earthquake?


[Q]: Bouyant force is the upward force exerted by fluids when any object, such as a boat, is placed in it.
[A]:
What is the upward force exerted by fluids when any object, such as a boat, is placed in it?