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

The height of the wave is used to determine the magnitude of an earthquake.
What measurement of the wave is used to determine the magnitude of an earthquake?

The discovery of ribozymes nullified the idea that all biological catalysts are proteins.
What nullified the idea that all biological catalysts are proteins?

Pressure and vibration are examples of physical type of stimuli.
Pressure and vibration are examples of what type of stimuli?