Life Cycle - Natural Environment (4A)
Pre Lab 

Use the picture of a soil profile to write a paragraph describing soil. Start with the surface and describe each layer working down the section.

Surface: organic material dead plants, animal material
O horizon

Topsoil: plant roots, bacteria, fungi, small animal
A horizon

Subsoil: Fewer organisms less topsoil; plants don't grow well
B horizon

Altered Parent Material: Weathered, less living matter layers above were formed form it
C horizon



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