Concept:Physical weathering breaks down rocks without changing their chemical composition.Explanation:Frost action is physical weathering because repeated freezing and thawing of water splits rocks apart.Temperature changes are also physical weathering, as expansion and contraction cause rocks to crack.Hydrolysis and oxidation are chemical weathering processes because they alter the minerals in rocks.Thus, the physical weathering processes are I. Frost action and IV. Temperature Changes.Answer:B. I and IV only