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(Para A) Obsidian was formed when heat from a _________ melted sand.
volcano
( Para B) From the first century BC, most glass _________ were made by a technique called glass blowing
containers
( Para B) It was in ______________ that the Romans empire collapsed
467 AD
( Para B) ( After the 10th century, the artistic glass bottles of the ________ made them famous
Venetians
(Para C) The new glass made by George Ravenscroft was particularly important to the __________
optical industry
( Para A) The first hollow glass container wasn't made before ____________
1500 BC
( Para B) By adding _________, glass makers tinted colourless glass in the 1st centure AD.
colouring materials
(Para C) Since George Ravenscroft's glass was ____________, it can be decorated with ease.
softer
(Para D) The use of glass in the construction industry dates back to ___________.
1851
(Para D) Thanks to the growth of technology and ________, there were improvements in glass manufacturing techniques.
