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.
What is a Netbook? A netbook is a device that can perform the majority of the functions of a desktop or laptop, but is extremely mobile. Netbooks look like miniature laptops, with screens rarely exceeding 10 or 12 inches.