How explosively or quietly a volcano erupts is not affected by the a. magma’s composition c. concentration of dissolved gases in the magma

Answerdistinguish between the mercalli scale and the richter scale;

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.

Most of russia is located c) at high northern latitudes. that is one of the reasons both napoleon and hitler failed in their attempts to defeat russia--the extreme cold contributed to their defeat.