Question

(c)
is the hardest known material.​

Answer 1

Answer:

Diamond

Explanation:

Please mark my answer as brainliest

Answer 2

Answer:

Currently, diamond is regarded to be the hardest known material in the world. But by considering large compressive pressures under indenters, scientists have calculated that a material called wurtzite boron nitride (w-BN) has a greater indentation strength than diamond.