Spalling of silica bricks occurs due to abrupt volume changes, when it is cooled below a temperature of __________ ¬∞C.$

Spalling of silica bricks occurs due to abrupt volume changes, when it

1.	Spalling of silica bricks occurs due to abrupt volume changes, when it is cooled below a temperature of __________ ¬∞C.$
A.	770
B.	570
C.	270
D.	70
Answer» D. 70