Sometimes it's a complex system of technical terms, such as the specialized language used in medicine or law. In other cases, it's a less-formal system of abbreviations and acronyms. For example, job advertisements frequently use acronyms such as DOE or EOE to streamline their postings. Understanding the meaning of these and other terms can simplify the job-hunting process.
Limestone hills, Cotswolds. The Cotswold hills are made of Oolitic limestone, a type of limestone made up of small round grains. These formed in shallow, warm waters like those found today around Florida and parts of the Caribbean Sea, where calcium carbonate is deposited from sea water due to evaporation.
Sand sized particles are lithified to form a sandstone. Silt and clay sized particles are lithified to form a mudstone if massive or a shale if fissile (fractures on fine bedding planes). Limestone is the rock formed by calcite. Calcite is very near saturation in sea water and so is used as shells material by marine organisms. Most calcite rocks of phanerozoic age (the last 600 million years) are of biological origin.