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.
For a college student, a slim and powerful 13-inch Ultrabook laptop works wellâand won't take up too much valuable space in the dorm room. High-end: The Apple MacBook Air 13-inch MD231LL/A ($1,200) was an excellent performer in our tests, and has a very long battery life of 9 hours.