What is the hardest natural substance in the world?

What is the hardest natural substance in the world?

Q.1 What is the hardest natural substance in the world?

Ans. Diamond

Q.2 What is the group of stars called that from an imaginary picture?

Ans. Constellation

Q.3 Who invented the Telephone?

Ans. Alexander Graham Bell

Q.4 When did India observe its first Earth hour?

Ans. 2009

Q.5 What star sign are you if you were born in early February?

Ans. Aquarius

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