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.
Oolitic limestone was used to build the Pentagon as well as other buildings around the world, such as Buckingham Palace and the Empire State Building. Scientists have discovered that oolitic limestone is actually a material which was made out of microbes that existed 200 million years ago, at the time of the Jurassic era when dinosaurs were still present on the Earth.