Water is the only substance on Earth that exists in all three states of matter at the temperatures found on Earth. In its solid and liquid states, water is responsible for the processes of weathering, erosion, and deposition that change the surface of Earth. Classify each description as an example of weathering, erosion, or deposition. Write W for weathering, E for erosion, and D for deposition. Rainwater carries dissolved salt minerals into the ocean. Water gets inside cracks in boulders. The Colorado river carries away rock particles, forming the Grand Canyon. A river forms a delta. Mounds of large rock are often found in areas that were once covered by glaciers. In a stream, rocks and sand rub against each other.