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Devonian period
(Encyclopedia) Devonian periodDevonian perioddĭvōˈnēən [key], fourth period of the Paleozoic era of geologic time between 408 and 360 million years ago (see Geologic Timescale, tablegeologic…sodium
(Encyclopedia) sodium, a metallic chemical element; symbol Na [Lat. natrium]; at. no. 11; at. wt. 22.98977; m.p. 97.81℃; b.p. 892.9℃; sp. gr. 0.971 at 20℃; valence +1. Sodium is a soft, silver-white…solar energy
(Encyclopedia) solar energy, any form of energy radiated by the sun, including light, radio waves, and X rays, although the term usually refers to the visible light of the sun. Solar energy is needed…centipede
(Encyclopedia) CE5 Centipede, representative of the class Chilopoda centipede, common name for members of a single class, Chilopoda, of the phylum Arthropoda. Centipedes are the most familiar of…mining
(Encyclopedia) mining, extraction of solid mineral resources from the earth. These resources include ores, which contain commercially valuable amounts of metals, such as iron and aluminum; precious…lichen
(Encyclopedia) lichenlichenlīˈkən [key], usually slow-growing organism of simple structure, composed of fungi (see Fungi) and photosynthetic green algae or cyanobacteria living together in a…saxifrage
(Encyclopedia) saxifragesaxifragesăkˈsĭfrĭj [key], common name for several members of the Saxifragaceae, a family of widely varying herbs, shrubs, and small trees of cosmopolitan distribution. They…Silurian period
(Encyclopedia) Silurian periodSilurian periodsĭl&oobreve;rˈēən, sī– [key] [from the Silures, ancient tribe of S Wales, where the period was first studied; named by the British geologist R. I.…oyster
(Encyclopedia) oyster, bivalve mollusk found in beds in shallow, warm waters of all oceans. The shell is made up of two valves, the upper one flat and the lower convex, with variable outlines and a…Superior, Lake
(Encyclopedia) Superior, Lake, largest freshwater lake in the world, 31,820 sq mi (82,414 sq km), 350 mi (563 km) long and 160 mi (257 km) at its greatest width, bordered on the W by NE Minnesota, on…Trending
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