FTR is a British rapid-transit bus system, currently in operation in Leeds, Luton and Swansea.irst Group has introduced the system, using Wright StreetCar articulated buses in conjunction with infrastructure upgrades by local authorities. The vehicles have been branded as the future of travel, the operators claiming that ftr is textspeak for the word future.
Limestone is a sedimentary rock, composed mainly of skeletal fragments of marine organisms such as coral, forams and molluscs. Its major materials are the minerals calcite and aragonite, which are different crystal forms of calcium carbonate (CaCO3).
what is the chemical compositions of limestone, chalk and marble ... Limestone: Rock Uses, Formation, Composition, Pictures. Chalk: A soft limestone with a very fine texture that is usually white or light gray ... Flux Stone: Crushed limestone is used in smelting and other metal refining ...