Ais a mound of sand that is created by the wind and usually is formed on sea coasts or in deserts

Ice melting no wait thats global warming

Idk bro sorry  lava is hotter then magma but im  not sure about it alll

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.