Natural sources refer to materials or resources that come from the environment without human intervention. These include elements like water, air, soil, minerals, and various forms of energy such as sunlight and wind. Natural sources are essential for sustaining life and supporting ecosystems, providing habitats for wildlife and resources for human use. Examples of natural sources include forests, rivers, and oceans, which offer food, shelter, and raw materials. Additionally, fossil fuels like coal and oil, formed over millions of years, are also considered natural sources. Understanding and managing these resources is crucial for environmental conservation and sustainable development.