Answer:
U shaped vallies?
Explanation:
(i dont know if this was one of the options)
One atom of carbon weighs exactly 12/6.022x10^23 = 1.9927x10^-23 grams<span>.</span>
When solid surfaces slide over each other, the kind of friction that occurs is called <u>Sliding Friction.</u>
I definitly believe the answer is c. 2
