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Gabbykae
pretty sure its Ph scale i did a question like this once but i cant remember....its either Ph or richer
tcopelandstone

The answer is (D) Richter scale.

The pH scale is used to measure acid/alkalinity

The Moh's scale is used to find out how hard a mineral is.

The Kelvin scale is a unit of measure of temperature.

Therefore, the only answer is D.