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Lewis and Clark expedition

(Encyclopedia)Lewis and Clark expedition, 1803–6, U.S. expedition that explored the territory of the Louisiana Purchase and the country beyond as far as the Pacific Ocean. The men were gathered and in the winte...

Ashmore and Cartier Islands

(Encyclopedia)Ashmore and Cartier Islands ăshˈmōr, cärˌtē-āˈ [key], unhabited tropical islands, 2 sq mi (5 sq km), E Indian Ocean, a dependency of Australia located 190 mi (300 km) NW of N Western Australia...

Kentucky and Virginia Resolutions

(Encyclopedia)Kentucky and Virginia Resolutions, in U.S. history, resolutions passed in opposition to the Alien and Sedition Acts, which were enacted by the Federalists in 1798. The Jeffersonian Republicans first r...

Mason and Slidell Affair

(Encyclopedia)Mason and Slidell Affair: see Trent Affair. ...

Merovingian art and architecture

(Encyclopedia)Merovingian art and architecture mĕrˌəvĭnˈjēən [key]. This period is named for Merovech, the founder of the first Germanic-Frankish dynasty (c.a.d. 500–a.d. 751). The Merovingian period was m...

art conservation and restoration

(Encyclopedia)art conservation and restoration, the preservation of structurally sound works of art, the halting of processes that lead to the damage of works of art, and the repair of already damaged works of art....

Lorraine, Lower and Upper

(Encyclopedia)Lorraine, Lower and Upper: see Lotharingia. ...

perfluoroalkyl and polyfluoroalkyl substances

(Encyclopedia)perfluoroalkyl and polyfluoroalkyl substances (PFAS), a group of several thousand synthetic organic chemical compounds made up of a chain of carbon atoms bonded to fluorine atoms. PFAS, which resist w...

rock carvings and paintings

(Encyclopedia)rock carvings and paintings, designs inscribed on rock surfaces and huge stone monuments in many parts of the world by prehistoric or preindustrial peoples. They have been found on every continent and...

Romanesque architecture and art

(Encyclopedia)Romanesque architecture and art, the artistic style that prevailed throughout Europe from the 10th to the mid-12th cent., although it persisted until considerably later in certain areas. The term Roma...