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Earth Sciences 8 Online
OpenStudy (anonymous):

The top layer of the soil in the diagram is composed MAINLY of A) sand and clay. B) solid bedrock. C) many types of minerals. D) decaying organic material.

OpenStudy (anonymous):

many types of mineral

OpenStudy (gottennis121):

I have to disagree with @yasminej. This link states that decomposed organic material is the top layer of soil (O horizon). http://www.enchantedlearning.com/geology/soil/

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