What problems do you think would develop from a system which divided people into socioeconomic groups (rich, middle class, poor, etc.) and did not allow people to advance from a lower class to a higher class? Be as detailed as possible with the types of problems.

Multiple questions. specify one

Magma forms by partial melting of upper mantle and crust. partial melt means that only a fraction of the available material forms a melt, and that the remainder stays solid. the partial melt rises because of its lower density and ascends through he crust. this is so conclusive mean the answer would be magma igneous rocks or balistic magma.