If given a mixture of 70 grams of silica (SiO₂) and 30 grams of soda (Na₂O) which is heated until it melts completely, then cooled to equilibrium temperature, and continued with cooling in air. After this process, what is expected to be observed?
A) Formation of crystals
B) Formation of a glassy substance
C) No change in the mixture
D) Separation of silica and soda