Plastics are materials that are made in factories and can be formed into almost

any shape. There are about 50 main types of plastic. Most plastics are strong long

lasting and lightweight.

Glass is a unique substance with many purposes

it is hard to the touch but it is not actually a

solid. Its chemical make up is similar to that of

a liquid. Glass usually allows light to pass through

it. It is easily breakable but it can be treated

to became very strong. It resists most chemical

and can be formed into all kinds of shapes.

Rubber is a substance

that is found in many

products from tyres

to toys. Natural

rubber is made from

the milky sap of

certain plants. The

India rubber plant

is a common

houseplant. Most

of the world’s

natural rubber,

however, comes

from trees with the

scientfic name

Hevea brasilliensis.