diamond
iron
lead
copper
Answer is Right!
Answer is Wrong!
The correct answer is A. diamond.
Diamond is the hardest natural substance on Earth. It is a form of carbon that has been subjected to extreme pressure and heat. This has caused the carbon atoms to arrange themselves in a tetrahedral structure, which is the strongest possible arrangement. Diamonds are also very dense, which makes them even harder.
Iron is a metal that is often used in construction and manufacturing. It is strong and durable, but it is not as hard as diamond.
64 74.6 75.5c-23.5 6.3-42 24.9-48.3 48.6-11.4 42.9-11.4 132.3-11.4 132.3s0 89.4 11.4 132.3c6.3 23.7 24.8 41.5 48.3 47.8C117.2 448 288 448 288 448s170.8 0 213.4-11.5c23.5-6.3 42-24.2 48.3-47.8 11.4-42.9 11.4-132.3 11.4-132.3s0-89.4-11.4-132.3zm-317.5 213.5V175.2l142.7 81.2-142.7 81.2z"/> Subscribe on YouTube