Which of the following pairs of countries was once a single country? . ethiopia and eritrea. eritrea and sudan. somalia and ethiopia. eritrea and madagascar

A. Ethiopia and Eritrea is the best answer.

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.