question 1 of 20\nthe test of a rocks hardness using a nail or penny is a ____________ test?\nchoose only…

question 1 of 20\nthe test of a rocks hardness using a nail or penny is a ____________ test?\nchoose only one best answer.\na hard test\nb streak test\nc penny test\nd scratch

question 1 of 20\nthe test of a rocks hardness using a nail or penny is a ____________ test?\nchoose only one best answer.\na hard test\nb streak test\nc penny test\nd scratch

Answer

Brief Explanations:

Scratch - testing is a common method to determine a rock's hardness by seeing if a harder object (like a nail or penny) can scratch the rock. A hard test is not a standard term for this. A streak test involves rubbing a mineral on a streak - plate to observe the color of the powder left behind. Penny test is not a formal geological term for this hardness - determination method.

Answer:

D. scratch