Answer:
Hornfels most commonly form in the aureole of granitic intrusions in the upper or middle crust. Hornfels formed from contact metamorphism by volcanic activity very close to the surface can produce unusual and distinctive minerals.
Answer:
1.2,dibromoethane is the sha'awa .
Answer:
2H2 + O2 -----> 2H2O
Not sure about the second question though.
The solid melts and becomes a liquid.