Where are earthquakes most likely to occur? A: Where a seismograph is located
B: human populations are densest
C: Where rock is at lowest temperature underground
D: Where rock experiences the most pressure underground

the principles and empirical processes of discovery and demonstration considered characteristic of or necessary for scientific investigation, generally involving the observation of phenomena, the formulation of a hypothesis concerning the phenomena, experimentation to test the hypothesis, and development of a conclusion that confirms, rejects, or modifies the hypothesis.