Bed Rock Reduced to Aggregate Naturally

Aggregates are formed by some reduction procedure in nature from the bedrock. The earth’s crust which is termed as the most important part of its geography consists of solid rocks called bed rock. and the major  part of solid rocks are covered by soil particles derived from the bedrock, according to size these soil is classified as gravel, sand, silt and clay. 

Sand and gravel are generally termed as natural aggregate, because they occur in nature by one time broken from a large massive parent rock, which was transported by nature such as wind and water and left in various types of deposits called and or gravel bank. This process of forming aggregate particles by natural process from bedrock includes breaking or crushing the bedrock, transporting the broken rocks with natural transporting agents and depositing it in various in various lands and river banks. In this process the sedimentary rocks are crushed into metamorphic rocks or igneous rocks which can also interchange within themselves. After some mechanical and chemical weathering it is formed as residual which is called as the unfinished aggregate and then transported and deposited.