Limestone high quality quarried limestone, called Indiana limestone. Many famous buildings in London are built from Portland limestone. Limestone was also a very popular building block in the Middle Ages in the areas where it occurred, since it is hard, durable, and commonly occurs in easily accessible surface exposures. Many medieval churches and castles in Europe are made of limestone. Beer stone was a popular kind of limestone for medieval buildings in southern England. Limestone and (to a lesser extent) marble are reactive to acid solutions, making acid rain a significant problem to the preservation of artifacts made from this stone.
Leopard to Sanskrit ("snake", "tiger" or "panther"), and probably derives from a Mediterranean language, such as Egyptian. The name was first used in the 13th century. Other vernacular names for the leopard include graupanther, panther and several regional names such as "tendwa" in India. The term "black panther" refers to leopards with melanistic genes. A term for the leopard used in Old English and later, but now very uncommon, is "pard". The scientific name of the leopard is "Panthera pardus". The generic name "Panthera" derives from Latin via Greek πάνθηρ ("pánthēr"). The term "panther", whose first recorded use dates back to