BTN 2022 Episode 23

What is obsidian?

• Marvel character

• Natural Glass

• Metal

• Gas

Obsidian is formed when molten rock from a volcano cools slowly.

• True

• False

The main ingredients in making glass is heat and ____.

• Sand

• Metal

• Rock

• Plastic

By the ____ many European cathedrals were being decorated with stained glass windows.

• 1000s

• 1100s

• 1200s

• 1300s

Mirrors were invented in the 16th century in ____.

• Rome

• Venice

• Milan

• Bologna

In the ____ century in Northern Italy the first glasses to enhance eye sight were invented.

• 11th

• 12th

• 13th

• 14th

Reading glasses use ____, which is the way light bends as it passes through transparent surfaces.

• Reflection

• Retention

• Refraction

• Reduction

Recycling glass dates back to the ____ Empire.

• British

• Roman

• German

• Egyptian

There are 40 recycling centres in metropolitan ____, with 120 across the state.

• Western Australia

• Victoria

• Queensland

• South Australia

In Australia, around ____ of all glass products come from recycled glass.

• 20%

• 30%

• 40%

• 50%