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Subject :NSO    Class : Class 8

The tremors produce waves on the surface of the earth. These are called __(i)__. The waves are recorded by an instrument called the __(ii)__. Richter scale is a __(iii)__ scale. An earthquake of magnitude 6 has __(iv)__ times more destructive energy than an earthquake of magnitude 4.

(i) (ii) (iii) (iv)
A Earthquakes Seismowave Linear Hundred
B Earthquakes Seismograph Linear Thousand
C Seismic waves Seismograph Non-linear Thousand
D Seismic waves Seismophone Non-linear Hundred


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hi

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