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.
Yet when you consider that its rugged design gives it a much longer lifespan than any mainstream laptop, you'll admit that it offers outstanding value in relation to price. The Toughbook-W7 is another model that shows off Panasonic's imaginative approach to design and rugged construction techniques. This laptop fits into the ultralight classification, sporting a 12.1-inch screen and weighing 3 pounds.