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.

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

Explanation:

The Mercalli Scale is a way to rate the earthquakes according  to the level of damage at a given place. It got its name after the Italian seismologist  Giuseppe Mercalli .  The scale has 12 divisions. Lower numbers indicate intensity that is likely felt by people where as the  higher numbers indicates the damage to structures and buildings. The ratings are given in Roman numerals. This scale is presently called as the MMI scale, or the Modified Mercalli scale.

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