instruction:
Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
question:
Seismologists originally measured the intensity of an earthquake with the mercalli scale.
answer:
How did seismologists originally measure the intensity of an earthquake?


question:
An excellent solvent that holds heat well and allows hydrogen bonds, water substance has many properties critical to life.
answer:
An excellent solvent that holds heat well and allows hydrogen bonds, what substance has many properties critical to life?


question:
Noble type of gas is used to fill glass tubes of lighted signs.
answer:
What type of gas is used to fill glass tubes of lighted signs?