A sign shows that the road has a grade of 12%. To the nearest degree , what is the angle of elevation of the road ?

How am i supposed to know your lecture

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.

The correct answer is:   [b]:   "has no atmosphere" .