What is the name of the CalTech seismologist who invented the scale used to measure the magnitude of earthquakes?

1. 

What is the name of the CalTech seismologist who invented the scale used to measure the magnitude of earthquakes?
[A]. Charles Richter
[B]. Hiram Walker
[C]. Giuseppe Mercalli
[D]. Joshua Rumble

Answer: Option A

Explanation:

Richter was born on an Ohio farm in 1900. He died in 1985.

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