As melts cool their viscosity increases (they lose their mobility and get stiffer) even before they start to crystallize because_________ .
A) their ions become more disordered
B) the silica tetrahedra in the melt start to link up and make larger and stronger units
C) they increase in volume
D) all of the sodium and potassium escape

Question

Quizplus · Accepted Answer

As melts cool, the silica tetrahedra within them begin to link up, forming larger and more complex structures. This process increases the viscosity of the melt, making it stiffer and less mobile even before crystallization starts.

As Melts Cool Their Viscosity Increases (They Lose Their Mobility