Respuesta :
The C horizon (parent material) is the least weathered soil horizon.
C horizons/layers: Horizons or layers that are bit affected by pedogenic processes and do not have the characteristics of O, A, E, or B horizons, excluding hard bedrock.
What is horizon of soil?
The interactions of these four soil processes reorganize the soil constituents into visibly, chemically, and/or physically different layers known as horizons. The soil horizons are O, A, E, B, and C. (The letter R stands for bedrock.)
Within a soil, there really is no set order for all these horizons. Some soil profiles contain an A-C combination, while others contain an O-E-B, an O-A-B, or simply an O. Some profiles, O-A-E-B-C-R, may have all of the horizons. And some profiles, such as an A-B-E-B, may have multiple variations of the same horizon. There are some oversimplified notions of how soil layers develop over time; these are expressed below; however, because natural processes vary over geological timescales, generalized concepts can be overly general.
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