Which statement about the Mercalli scale is true?

The scale has twenty ratings for an earthquake’s effects.
The scale rates an earthquake based on its total energy released.
The scale rates an earthquake according to how much damage it causes.
The scale is most useful when scientists use data from three or more seismographs.

The statement 'the scale rates an earthquake according to how much damage it causes.' about the Mercalli scale is TRUE.

The Mercalli scale is a seismic intensity scale used in order to determine the intensity of shaking generated by an earthquake.This scale (Mercalli scale) can be considered arbitrary because it is based upon observations of damage on the earth's surface after an earthquake.The Mercalli scale was developed by Giuseppe Mercalli in 1884 and subsequently expanded in 1902 in order to include 12 different degrees of seismic intensity.

In conclusion, the statement 'the scale rates an earthquake according to how much damage it causes.' about the Mercalli scale is TRUE.

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