What is able to occur because no surface is perfectly smooth?

What is able to occur because no surface is perfectly smooth?

Correct Answer: friction
temperature
mass
tension

Explanation: Friction occurs because no surface is perfectly smooth. Even surfaces that look smooth to the unaided eye appear rough or bumpy when viewed under a microscope. Look at the metal surfaces in Figure below . The metal foil is so smooth that it is shiny. However, when highly magnified, the surface of metal appears to be very bumpy. All those mountains and valleys catch and grab the mountains and valleys of any other surface that contacts the metal. This creates friction.

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