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.
How Do Soils Form? Dig down deep into any soil, and youâll see that it is made of layers, or horizons. Put the horizons together, and they form a soil profile. Like a biography, each profile tells a story about the life of a soil. Every soil originally formed from parent material: a deposit at the Earthâs surface. The material could have been bedrock that weathered in place or smaller materials carried by flooding rivers, moving glaciers, or blowing winds.