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

[EX Q]: Seismologists originally measured the intensity of an earthquake with the mercalli scale.
[EX A]: How did seismologists originally measure the intensity of an earthquake?

[EX Q]: Breast cancer is the most common type of cancer in adult females.
[EX A]: What is the most common type of cancer in adult females?

[EX Q]: The mars rover collected round clumps of crystals that, on earth, usually form in water.
[EX A]:
The mars rover collected round clumps of crystals that, on earth, usually form in what?