1. Why are some places on earth really hot, or really cold, or
very dry, or wet?

Answer your driving test ;

Maybe on the physical part? i dunno i just guessed plus i really need the points

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.