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).
Concrete, for example, is made up of stones, sand and gravel and mixed with cement. Rocks are also used to make medicine, weapons and cosmetics. Various types of rock have been used to make historic monuments, like the ancient Egyptian pyramids.Rock that contains metals is called ore. Iron, copper, lead, gold, and uranium are among the most important ores.hese organic sediments harden and turn into rock. Sandstone and limestone are two of the most important and widespread sedimentary rocks. These sediments contain fossil fuels, like oil and gas. Limestone is made up of shells and skeletons of living things.