What happened in bosnia during the 1900's?

At the beginning of the 20th century, Bosnia went through a crisis because because the Austro-Hungary empire decided to annex the country, even though it was officially under Ottoman rule.

Answer after wwii, communist countries in eastern europe formed the warsaw pack, a military alliance, and comecon, an economic alliance;

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.