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 hybrid has very much taken over from the Ultrabook as the focal point for notebook development. Where Dellâs regular notebooks have had incremental developments, such as the Latitude 3330, the XPS 11 2-in-1 Ultrabook is something of a radical departure.