Which glass is used for making laboratory apparatus?

Unscramble the letters to name the following. 

It is made by melting sand and other minerals together at very high temperatures.

LGSAS 

Build up your vocabulary! Read the meanings and give two examples in the space given:

Fragile object: an object that gets broken easily

Examples of fragile objects: _____

Who is my partner ?

‘A’ column             ‘B’ column
a. Lead glass          i. Plates
b. Bakelite              ii. Mattresses
c. Thermocol         iii. Electric bulb
d. Optic glass         iv. Electric switch
e. Polypropylene     v. Lens

Fill in the blank with a suitable word:

Stained glass is made by adding different _____ (metals/ chemicals) to the mixture from which glass is made.