The plant roots push on the rocks as the plants grow. Animals and even people can change rocks. Animals make places for weathering to happen. For instance, some animals make tunnels in the ground which loosens rocks and soil. Their tunnels allow air and water to move deeper into the ground.
People also change rocks.
People use machines to break rocks. We also dig tunnels and build roads through rocks. People build houses or statues out of rocks. Workers break the rocks into smaller pieces to use on buildings. Ask students to jot down the definition of weathering in their own words.