Question

Sam's teacher wants to test two rocks to see if they are made of the same minerals. Which test should he carry out? A) He should pour water on the rocks. B) He should weigh each one of the rocks. C) He should rub the rocks on a plate to see the color. D) He should try to scratch the rocks with his fingernail.

Answer 1

C) He should rub the rocks on a plate to see the color.

Step-by-step explanation:

This is a streak test. Only one mineral can be scratched with your fingernail, talc. If the rocks do not have talc, that test will not help him. The BEST test would be a streak test. He could also check the crystal structure.

Answer 2

He should weigh the rocks

Step-by-step explanation:

If they are a de out of the same minerals they should weigh around the same weight