The Mercalli intensity scale refers to a seismic intensity scale used for determining the earthquake intensity. It determines the influences of an earthquake. It is different from the moment magnitude, which is generally reported for an earthquake that is a determination of the energy discharged.
The Mercalli scale determines the influences of an earthquake on the surface of the Earth, objects of nature, humans, and made-made compositions on a scale from I to XII. It refers to a scale that quantifies earthquakes on the basis of their intensity and how much destruction they make at a specific place.
Hence, the correct answers are options this scale rates an earthquake according to how much damage it causes, and this scale uses Roman numerals to rank the damage caused by an earthquake.