Which of the following best explains a hardness scale
A scale that tests the hardest of mineral by scratching other material
A scale that test the hardness of a rock by scratching other materials
A scale that tests the hardness of a mineral by being rubbed on other material
A scale that test the hardness of a rock by being rubbed on other materials
1 answer
A scale that tests the hardness of a mineral by being rubbed on other material
3 answers