Boulders are large rocks that have been naturally shaped by weathering and erosion. They are typically defined as rocks that are at least 10 inches in diameter, but many can be much larger. Boulders can be found in various environments, including mountains, riverbeds, and coastal areas. They are often made of different types of rock, such as granite, limestone, or basalt. Boulders play an important role in ecosystems by providing habitats for various plants and animals. They can also influence the landscape by affecting water flow and soil erosion. In addition, boulders are often used in construction and landscaping, serving as decorative elements or structural supports in projects involving gardens, parks, and buildings.