Sand grains

Sand grains are small, solid particles that typically consist of minerals, rock fragments, and shells. They usually measure between 0.0625 mm and 2 mm in diameter and are a key component of beaches, deserts, and riverbeds. Sand forms through the weathering and erosion of larger rocks over long periods. Its composition can vary widely—common materials include quartz, feldspar, and calcite. Sand is crucial for construction, manufacturing glass, and serving as a habitat for many organisms. It also plays a vital role in natural processes, such as water filtration and coastal protection.