Cassiterite is the chief ore of...

zinc

lead

tin

copper

Cassiterite is a tin oxide mineral. Its luster and multiple crystal faces produce a desirable gem. Cassiterite has been the chief tin ore throughout ancient history and remains the most important source of tin today.

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Brass is an alloy made of ...

nickel and copper

zinc and copper

bronze and copper

brass is a chemical element

When and where was the idea of gold, silver and bronze medals for sport event competitors introduced?

10th century BC, Ancient Greece

3rd century AD, Ancient Rome

1904 Summer Olympics, St. Louis

1936 Summer Olympics, Berlin

What material are church bells made of?

What bird is that?

rufous-necked hornbill

ground hornbill

yellow-billed hornbill

rhinoceros hornbill