Question

Define
(a)a seismograph
(b)a richter scale



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Answer 1

b. richer scale is used to measure the magnitude of the earthquake .
a. it is an instrument which is used to record the details of the earthquake.

Answer 2

Seismograph is an instrument that measures and records information about earthquakes

Richter scale is a numerical scale for expressing the magnitude of an earthquake on the basis of seismograph oscillations