State a problem. Describe what you want to find out about the relationship of the following factors to the amount of water erosion that occurs on a slope: slope gradient, presence or absence of vegetation, and rain intensity.

The answer is trial 3.

Caused conformity rates to go down. apex ; )

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