Consider the following statements regarding the earthquakes: I. The intensity of earthquake is measured on Mercalli scale. II. The magnitude of an earthquake is a measure of energy released. III. Earthquake magnitudes are based on direct measurements of the amplitude of seismic waves. IV. In the Richter scale, each whole number demonstrates a hundredfold increase in the amount of energy released. Which of these statements are correct ?
Options
(a)I, II and III
(b)II, III and IV
(c)I and IV
(d)I and III
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