Informal assessments are best described as ?

I’m confused ///: : : :

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.

Ascenario that doesnt  include any modern objects like electricity

According to new research, more than 5..5 million deaths are associated with polluted air. hope this : ).