Cholangiocarcinoma is a rare cancer found in the tissue of the bile ducts, occurring in approximately two out of 100,000 people. Men and women are equally affected and most cases occur in people over age 65. The bile duct is a small tube that connects the liver and gallbladder to the small intestine. The ducts carry bile -- the liquid that helps break down fat in food during digestion â out of the liver. Tumors can develop anywhere on the bile ducts and are typically slow growing.
Soil formation is a long slow process. It's estimated that an inch of soil takes 500 to 1000 years to form. Soil is constantly being formed. It is also constantly being eroded.
Soil has texture The particles that make up soil are categorized into three groups by size: sand, silt, and clay. Sand particles are the largest and clay particles the smallest. Although a soil could be all sand, all clay, or all silt, that's rare. Instead most soils are a combination of the three. The relative percentages of sand, silt, and clay are what give soil its texture. A loamy texture soil, for example, has nearly equal parts of sand, silt, and clay. Soil has structure. Soil structure is the arrangement of soil particles into small clumps, called peds. Much like the ingredients in cake batter bind together to form a cake, soil particles (sand, silt, clay, and organic matter) bind together to form peds.