This is a list of first overall National Football League draft picks. The National Football League draft is an annual sports draft in which NFL teams select newly eligible players for their rosters. To be eligible, a player must be out of high school at least three years. Each NFL franchise seeks to add new players through the annual NFL draft. The draft rules were last updated in 2009. The team with the worst record the previous year picks first, the next-worst team second, and so on. Teams als
Limestone is a sedimentary rock composed largely of the minerals calcite and aragonite, which are different crystal forms of calcium carbonate (CaCO 3).
Most limestone is composed of skeletal fragments of marine organisms such as coral, forams and molluscs. Limestone makes up about 10% of the total volume of all sedimentary rocks. The solubility of limestone in water and weak acid solutions leads to karst landscapes, in which water erodes the limestone over thousands to millions of years. Most cave systems are through limestone bedrock.