Unlike water, which turns from liquid to a solid at a specific temperature, glass has no specific melting or freezing point but is gradually changed from a stiff solid to a liquid mass as the temperature 
(water; turns; from liquid; to a solid; L:at a specific temperature) (glass; has; no specific melting or freezing point) (glass; is gradually changed; from a stiff solid; to a liquid mass as the temperature)
water glass glass
turns has is gradually changed
from liquid to a solid L:at a specific temperature
no specific melting or freezing point
from a stiff solid to a liquid mass as the temperature