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. They should also list ways that rocks are changed. Soil is made from pieces of broken rocks and minerals. It takes a long period of time to make soil. The glass will be cracked because when it froze, it expanded or pushed out.