MCP HS-OP10 3V Black ABS Portable Handheld Direct Ophthalmoscope with 5 Different Apertures & Storage Box

River sand children play area sand, River sand for plasting and construction. River sand is a naturally occurring granular material primarily composed of fine particles of rock and mineral, often gathered from riverbeds and riverbanks. It forms as rocks erode over time, breaking down into fine particles that are carried downstream by rivers and streams. River sand is usually smooth in texture due to natural weathering processes and often contains minerals such as quartz, feldspar, and mica. It has a range of uses in construction, particularly in concrete production, plastering, and bricklaying, because of its strength, consistency, and workability. Its natural composition makes it preferred over artificial sand for specific building purposes, as it generally offers better durability and aesthetic appeal in construction projects. However, over-extraction of river sand can lead to environmental issues, such as riverbank erosion and loss of biodiversity.