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Glass: a new world from sand
Words to learn: glass • sand • melting • shaping
How can ordinary-looking sand become clear glass?
WHAT DOES GLASS START WITH?
Most glass begins with sand, mixed with some other materials.
WHAT HAPPENS?
The mixture is heated until it becomes extremely hot and molten. It can then be shaped while it is hot.
WHAT HAVE WE MADE?
When it cools we have glass: a new material with very different properties from the sand we started with.
WHAT YOU NEED TO KNOW
NOW LOOK AT THE TEXTBOOK
