Rock flour, also known as glacial flour or glacier milk, is a fine-grained sediment consisting of rock particles that have been ground down by glacial erosion. Some other synonyms for rock flour include rock dust, glacial silt, and pulverized stone. These terms all describe the same process of rock material being crushed and pulverized into small particles. Rock flour is commonly found near glacial areas and can have an impact on ecosystems due to its ability to change the pH levels of soil and water. Despite its potential effects, rock flour plays an important role in shaping the Earth's landscape through the process of glacial erosion.