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]: The climate is defined as the temperature plus precipitation of an area over a long period of time.
[EX A]: What is defined as the temperature plus precipitation of an area over a long period of time?

[EX Q]: Archimedes' law explains why a ship weighing thousands of metric tons floats on water.
[EX A]:
Which law explains why a ship weighing thousands of metric tons floats on water?