3. Explain the discovery of mid-ocean ridges
helped support the hypothesis of continental
drift as well as explain some of the processes
that occur beneath Earth's surface. Where
does the material involved in sea-floor
spreading come from?

I  cant see the question.

Answer. first blank ; ; ; clockwise; the second blank; ///clockwise;

Can you show the map?

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.