How Erasers are Made

Which of the following is true about rubber trees?

• They are only in Southeast Asia.

• They are cheap to grow.

• They cause air pollution.

• They can give people allergies.

What part of the rubber tree is used to make rubber?

• The bark

• The roots

• The sap

• The leaves

How often can sap be collected from one tree?

• Every day

• Every hour

• Every few days

• Once a year

After the sap has been thickened, why is it rolled?

• It's fun to do.

• To remove extra water.

• To make it beautiful.

• To pack it.

Why are sheets of rubber dried?

• To make them thinner.

• To make them weaker.

• To make them longer.

• To make them stronger.

Why are the rubber sheets sprayed with calcium and solvent?

• It makes them softer.

• It protects them from mold.

• It protects them from insects.

• It vulcanizes the rubber.

What must be done to rubber before it can be used in an eraser?

• It must be softened with water.

• It must be vulcanized.

• It must be coloured orange.

• It must be rolled into balls.

What is done with defective erasers?

• They are burned.

• They are sold cheaply.

• They are used in new erasers.

• They are turned into stamps.

How long must sheets of eraser rubber be left to cool?

• Half a day

• Half a week

• Half a month

• Half a year

What are blue erasers used for?

• Erasing pen ink

• Erasing stamps

• Erasing correction tape

• Erasing paper