Check Your Understanding Direction: Write MW if the sentence describes mechanical weathering and CW if it describes chemical weathering. Write your answers on the answer sheet. 1. Roots of trees penetrate and gradually break rocks. 2. The wind blows sand against rocks and slowly wears them away. 3. Chemical reactions break down the bonds that hold the rock together. 4. Acidic water causes the slowly dissolving of the minerals in rocks and makes the rocks crack. 5. Worms and other burrowing animals break up rocks as they make tunnels. Remembo Or​