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.
Ultrabooks Guide. If you want one of the most portable computers on the market, consider getting an Ultrabook, a new kind of super-thin, ultra-light laptop that wakes from sleep quickly and offers a compelling Windows 8 experience.
HP EliteBook Folio 1020. One of the thinnest and lightest Ultrabooks yet, the EliteBook 1020 is just 0.62 inches thick and weighs just 2.68 pounds, making it more svelte than the Dell XPS 13 and the MacBook Air.