Weathering is the breaking down or dissolving of rocks and minerals on Earth's surface. Once a rock has been broken down, a process called erosion transports the bits of rock and minerals away. Water, acids, salt, plants, animals, and changes in temperature are all agents of weathering and erosion.
so its telling you to compare and contrast the diagrams like what changed and to describe the data you want to examine so whats going on is it changing or staying the same?
