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 MacBook Pro (sometimes abbreviated MBP) is a line of Macintosh portable computers introduced in January 2006 by Apple Inc. Replacing the PowerBook G4, the MacBook Pro was the second model to be announced during the AppleâIntel transition, after the iMac. It is the high-end model of the MacBook family and is currently available in 13- and 15-inch screen sizes. A 17-inch version was available between April 2006 and June 2012. The first generation MacBook Pro appeared externally similar to the PowerBook G4, but used Intel Core processors instead of PowerPC G4 chips.