Aggregate

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1. Soil structures made up of many soil particles held in a single mass, or mineral material of uniform fine size used in construction projects.

swi-5.gif

This picture shows a soil aggregate which includes sand, silt, and clay particles held together with organic matter in a larger unit.
Source: http://www.maf.govt.nz/mafnet/schools/activities/swi/swi-03.htm