John is hiking and notices a small stream of water flowing down the side of the mountain. What part of the water cycle is John observing? Question 3 options:

Runoff

Evaporation

Condensation

Precipitation

Answer(a)   the matererials that are in contact, the two materials and the nature of their surfaces/// (b)/// the force pushing the two surfaces together, pushing the surfaces together causes the more of the asperities to come together and increases the surface area in contact with each other