How do volcanoes contribute to the formation of new landform?

They help form rocks which help give us the knoledge

When the volcano erupts and when the magma or lava cools down it forms to rock and then primary succession occurs first, after the rock breaks over time dirt comes and then,licken or moss the organism that breaks the rock appears after the grass or weeds come and then bushes appear and then the little trees grow and finally, a big population of trees appears.

Answergoogle earth; i believe this is the correct answer, plz check first;

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.