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rubidium
(Encyclopedia)rubidium ro͞obĭdˈēəm [key], metallic chemical element; symbol Rb; at. no. 37; at. wt. 85.4678; m.p. 38.89℃; b.p. 686℃; sp. gr. 1.53 at 20℃; valence +1. Rubidium is a very soft silver-white ...right whale
(Encyclopedia)right whale, name for whales of the family Balaenidae. They were so named by whalers, who for centuries considered them “the right whales” to hunt, because they float when killed and because they ...Portsmouth, Treaty of
(Encyclopedia)Portsmouth, Treaty of, 1905, treaty ending the Russo-Japanese War. It was signed at the Portsmouth Naval Base, New Hampshire, on Sept. 5, 1905. Negotiations leading up to the treaty began in the sprin...estuary
(Encyclopedia)estuary ĕsˈcho͝oĕrˌē [key], partially enclosed coastal body of water, having an open connection with the ocean, where freshwater from inland is mixed with saltwater from the sea. One type of est...Five Civilized Tribes
(Encyclopedia)Five Civilized Tribes, inclusive term used since mid-19th cent. for the Cherokee, Chickasaw, Choctaw, Creek, and Seminole tribes of E Oklahoma. By 1850 some 60,000 members of these tribes were settled...storm
(Encyclopedia)storm, disturbance of the ordinary conditions of the atmosphere attended by wind, rain, snow, sleet, hail, or thunder and lightning. Types of storms include the extratropical cyclone, the common, larg...Huang He
(Encyclopedia)Huang He, Hwang Ho both: hwängˈ ho͝oˈ [key], or Yellow River, great river of N China, c.3,000 mi (4,830 km) long, rising in the twin lakes Gyaring and Ngoring in the Kunlun Mts., NW Qinghai prov....Northwest Passage
(Encyclopedia)Northwest Passage, water routes through the Arctic Archipelago, N Canada, and along the northern coast of Alaska between the Pacific and Atlantic oceans. Even though the explorers of the 16th cent. de...ocean
(Encyclopedia)ocean, interconnected mass of saltwater covering 70.78% of the surface of the earth, often called the world ocean. It is subdivided into four (or five) major units that are separated from each other i...mussel
(Encyclopedia)mussel, edible freshwater or marine bivalve mollusk. Mussels are able to move slowly by means of the muscular foot. They feed and breathe by filtering water through extensible tubes called siphons; a ...Browse by Subject
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