Topic Details (Notes format)

What is the hardest natural substance on Earth?

Which waterway connects the Mediterranean Sea to the Red Sea?

Which force is responsible for binding protons and neutrons in the atomic nucleus?

Which element has the chemical symbol "Sn"?

Which element has the chemical symbol "Bk"?

Who discovered the first gravitational lens?

Which element has the chemical symbol "Rh"?

Who discovered the ancient city of Mohenjo-daro?

Which empire built the famous Colosseum?

Which is the smallest planet in the solar system since Pluto’s reclassification?