How does the time between the arrival of S and P waves relate to the distance of the station to the epicenter?

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.

A. - canada and the u.s 

Ithink its d.stratum

The fact that the earth goes through natural cycles for example the ice age some scientists belive that it is just another cycle