Lakes and rivers are essential components of Earth's freshwater systems. A lake is a large body of water surrounded by land, often formed by geological processes like glacial activity or volcanic eruptions. Lakes can vary in size and depth, providing habitats for various plants and animals. Rivers, on the other hand, are flowing bodies of water that move from higher elevations to lower areas, eventually emptying into oceans, seas, or lakes. They play a crucial role in shaping landscapes and supporting ecosystems. Both lakes and rivers are vital for human activities, including drinking water, agriculture, and recreation.