|  |  | 
 
 
| 2 | materials from the living organisms | 
 
 
| 3 | when liquid soaks into soil | 
 
 
| 4 | the soil underneath the topsoil that hold most of the chemicals that drip down from the topsoil | 
 
 
| 5 | the layer of soil that is mostly comprised of broken up rocks | 
 
 
| 6 | the uppermost layer of soil that is formed from the organic material that lies on top of it | 
 
 
| 7 | how small or large an individual grain is | 
 
 
| 8 | the hard rock that lies beneath all the soil layers | 
 
 
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