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What is the hardest natural substance on Earth?

A
Gold
B
Iron
C
Diamond
D
Graphite
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🇮🇳 हिंदी Hindi Version
पृथ्वी पर सबसे कठोर प्राकृतिक पदार्थ कौन सा है?
A
सोना
B
लोहा
C
हीरा
D
ग्रेफाइट
Science 514/525
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