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).
During periods of glaciation, glacial abrasion has scraped away the topsoil to expose the bare rock underneath. Limestone is a sedimentary rock that is made up of horizontal cracks called bedding planes and vertical cracks called joints.Limestone is made of Calcium Carbonate which is dissolved by rainfall which is a weak acid. This process is called chemical weathering.As a result of these features water is able to seep down through the cracks and into the rock making it seem to disappear. Therefore limestone is said to be a permeable rock.A limestone pavement is formed when rain water seeps through the joints and dissolves the limestone on each side making the joint wider.uring periods of glaciation, glacial abrasion has scraped away the topsoil to expose the bare rock underneath. Limestone is a sedimentary rock that is made up of horizontal cracks called bedding planes and vertical cracks called joints.