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Where does natural rubber come from?

• liquid inside the rubber tree

• silk

What problem did people have with natural rubber?

• It became hard in the winter ,but it melted in the summer.

• It became hard in the summer ,but it melted in the winter.

How do we make glass?

• by heating sand at high temperature.

• by heating sand at low temperature.

What did people make with glass in the past, and what do they make now?

• jars and vase with glass in the past but bottles and dishes now.

• jars and bottles with glass in the past but vases and dishes now.

How do silkworms make silk?

• A fibre comes out of silksworms' cocoons when they build heads.

• A fibre comes out of silksworms' heads when they build cocoons.

When did people in Europe start making silk?

• around 5000 CE

• around 500 CE