Answer:
Richter Scale
Step-by-step explanation:
Richter Scale is the right answer because Richter Scale is what measures the power of an earthquake. It goes from 0-10. If there was an earthquake which had a magnitude (a level on the Richter Scale) of 4, then, if there was another earthquake which had a magnitude of 5, then the 5 was 10x stronger than 4 on the Richter Scale. That's how it's measured.
These scales... "iron scale, large scale" are NOT at all related to Richter Scale. And, siesmic scales aren't the same thing as Richter Scale.
So hence, your answer is the Richter Scale!
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