Natural materials are substances that come from the earth and are not altered by human processes. Examples include wood from trees, stone from quarries, and cotton from plants. These materials are often used in construction, clothing, and various crafts due to their availability and sustainability. Many natural materials are biodegradable, meaning they can break down naturally over time, reducing waste. They are also renewable, as they can be replenished through natural processes, such as forests growing back or crops being replanted. This makes them an important choice for environmentally conscious practices.