The correct answer is the Richter scale
Mercali is used to measure damage created by the earthquake, while the remaining two are not scales of measurement.
The full moon cycle (from one phase to the same phase again), from start to finish, is generally 28 days. That being said, from one phase to its opposite, or one half-cycle, would be approximately 14 days.
Your answer is measure the distance between places. Map scale refers to the relationship (or ratio) between distance on a map and the corresponding distance on the ground.
