The C horizon is below the A and B horizons of most soils. It consists of materials that were little altered by the soil-forming processes, though the materials may be modified by weathering. Below the C horizon in some soils is an R horizon of consolidated bedrock, such as limestone, shale, or sandstone.
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The 10 best Ultrabooks of 2017: top thin and light laptops reviewed. Techradar's top-ranking Ultrabook reviews. Update: We've shaken up our list to reflect the newly reformed specs of the HP Spectre x360, complete with the recently added 4K screen and 1TB SSD options. Read on to number 4 on our list to find out more!