The hardest natural substance is? EASY 1 Point -0.25 Negative MCQ #1381 General Knowledge General Science Federal NTS Question The hardest natural substance is? Options A Gold B Steel C Diamond D Quartz Reveal Answer Reset 📝 Explanation Diamond is the hardest known natural material, rating 10 on the Mohs hardness scale. It is a form of carbon where atoms are arranged in a crystal structure called diamond cubic. ← Previous MCQ📋 All MCQs📚 LearnNext MCQ → Related MCQs MEDIUM Blood type AB is called MEDIUM Blood type O is called EASY The Earth takes approximately how long to orbit the Sun?