Which scale of measurement measures the magnitude or strength of an earthquake based on seismic waves?
mercali
richter
moment magnitude
focus

The answer is moment magnitude scale or MMS. It is used by the seismologist to measure the size of an earthquake based on the energy released. In 1979, Moment magnitude was introduced by Hanks and Kanamori. Since then, it becomes the most commonly method used.

The answer is c, i, iii, and iv. this is because farming and mining deal with harvesting raw materials, construction work falls under manufacturing, and piloting a plane is a service. ii is wrong because making bread is using  raw materials to produce goods, which would fall under the secondary sector, not primary.

It just all depends on where you live at the moment