What is rivers b?

Rivers are important flowing water bodies that are formed naturally by surface runoff, groundwater flow or precipitation. They serve as sources of freshwater for human consumption, irrigation, and industries. Rivers also play a crucial role in regulating the climate, as they absorb, store, and transport carbon dioxide from the atmosphere, thereby mitigating global warming. They also provide a habitat for a diverse range of aquatic organisms, including fish and plants, and support the local ecosystem. River systems are often subject to human activities such as damming, channelization, pollution, and deforestation, which threaten their sustainability and environmental health. The world's longest river is the Nile River in Africa, while the Amazon River is the world's largest by discharge.