Q. The power of _______ is expressed in terms of a magnitude on a scale called Richter scale.
Answer: an earthquake
Notes: There are two ways in which scientists quantify the size of earthquakes : magnitude and intensity. Magnitude measures the energy released at the source of the earthquake; Intensity measures the strength of shaking produced by the earthquake at a certain location. The Richter Scale is used for measuring the magnitude of earthquakes. Mercalli scale is used to measure intensity of earthquakes.