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galena
(Encyclopedia)galena gəlēˈnə [key] or lead glance, lustrous, blue-gray mineral crystallizing usually in cubes, sometimes in octahedrons. It is the most important ore and the principal source of lead. It consist...Casa Grande
(Encyclopedia)Casa Grande käˈsä gränˈdā [key], city (2020 pop. 53,658), Pinal co., S Ariz.; inc. 1915. It lies in ...Tennessee-Tombigbee Waterway
(Encyclopedia)Tennessee-Tombigbee Waterway, system of navigation channels, 234 mi (377 km) long, Ala. and Miss., connecting the Tennessee River with the Tombigbee River and, via the Mobile River, with the Gulf of M...Webster-Ashburton Treaty
(Encyclopedia)Webster-Ashburton Treaty, Aug., 1842, agreement concluded by the United States, represented by Secretary of State Daniel Webster, and Great Britain, represented by Alexander Baring, 1st Baron Ashburto...New River
(Encyclopedia)New River, c.320 mi (510 km) long, rising in the Blue Ridge, NW N.C. It flows NE through SW Virginia, then NW into West Virginia where it joins with the Gauley River to form the Kanawha River. It is u...Iceland spar
(Encyclopedia)Iceland spar, colorless variety of crystallized calcite, characterized by its properties of transparency and double refraction. It is used chiefly in the manufacture of Nicol prisms, which are essenti...Nahuel Huapí
(Encyclopedia)Nahuel Huapí näwĕlˈ wäpēˈ [key], lake, c.210 sq mi (540 sq km), in Río Negro and Neuquén provs., W central Argentina. The 45-mi (72-km) lake is drained northeastward by the Limay River. It is...Louisiana Purchase
(Encyclopedia) CE5 Louisiana Purchase (1803) Louisiana Purchase, 1803, American acquisition from France of the formerly Spanish region of Louisiana. Jefferson instructed Livingston to attempt to purchase the ...Anáhuac
(Encyclopedia)Anáhuac änäˈwäk [key] [Aztec and Nahuatl,=near the water], geographical term used variously in Mexico before the Spanish Conquest. Today it commonly refers to that part of the central plateau of ...Pánuco
(Encyclopedia)Pánuco päˈno͞okō [key], river, c.315 mi (510 km) long, rising as the Santa María River in San Luis Potosí state, N central Mexico, and flowing generally east to empty into the Gulf of Mexico ne...Browse by Subject
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