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Read the following passage and select th...

Read the following passage and select the option which correctly fill the blanks.
`ul(" (i) ")` is the point of origin of an earthquake. `ul(" (ii) ")` measure the strength of an earthquake by estimating the amount of energy released at the focus. The point vertically above the origin on the surface of the Earth, is called `ul(" (iii) ")`. Seismic waves are detected, recorded and measured using `ul(" (iv) ")`.

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