pounds kilograms fluid ounces cubic centimeters
I gave my students this multiple choice question: Garrett collected some large rocks from a stream near his home. He measured the rocks on a balance. When he records the mass of the rocks, which units should Garrett use?

Only one answer is correct among these 4 choices:
- pounds
- kilograms
- fluid ounces
- cubic centimeters

Could you tell me which one is correct?

kilograms