Final answer:
The layers of the Earth are classified based on composition and have different physical and chemical properties.
Step-by-step explanation:
The layers of the Earth are classified based on composition of the layers. Each layer has different physical and chemical properties due to their distinct compositions. The Earth is divided into four main layers: the crust, mantle, outer core, and inner core. These layers vary in terms of their composition, temperature, pressure, and other geological characteristics.
Learn more about Earth's layers and their characteristics