Why two things are needed to calculate the magnitude of an earthquake

Amount of energy released by the earthquake, and distance from the epicenter.  hope that helps!

The magnitude of an earthquake is determined from the logarithm of the amplitude of waves recorded by seismographs. Adjustments are included in the magnitude formula to compensate for the variation in the distance between the various seismographs and the epicenter of the earthquakes

federal is the executive,   legislative is senate and house of representatives.   judicial is the supreme court and lower courts.

answercharacteristics of place include things like economic activity, architecture,and culture,all of which are human elements that alter or can be influenced by the environment;