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Possible definitions for earch
arch
Curved structure that spans the opening between two piers or columns and supports loads from above. The masonry arch provides the stepping stone from the post-and-beam system to the evolution of the vault, and was first widely used by the Romans. Its construction depends on a series of wedge-shaped blocks (voussoirs) set side by side in a semicircular curve or along two intersecting arcs (as in a pointed arch). The central voussoir is called the keystone, and the two points where the arch rests on its supports are known as the spring points. An arch can carry a much greater load than a horizontal beam of the same size and material, because downward pressure forces the voussoirs together instead of apart. The resulting outward thrust must be resisted by the arch's supports. Present-day lightweight monolithic (one-piece) arches of steel, concrete, or laminated wood are highly rigid, and thereby minimize horizontal thrust.
earth
Third planet in distance outward from the sun. Believed to be about 4.6 billion years old, it is about 92,960,000 mi (149,573,000 km) away from the sun. It orbits the sun at a speed of 18.5 mi (29.8 km) per second, making one complete revolution in 365.25 days. As it revolves, it spins on its axis, rotating once every 23 hours 56 minutes 4 seconds. The fifth largest planet of the solar system, it has an equatorial circumference of 24,902 mi (40,076 km). Its total surface area is roughly 197,000,000 sq mi (509,600,000 sq km), of which about 29% is land. Earth's atmosphere consists of a mixture of gases, chiefly nitrogen and oxygen. Its only natural satellite, the moon, orbits the planet at a distance of about 238,870 mi (384,400 km). The earth's surface is subdivided into seven continental masses: Africa, Antarctica, Asia, Australia, Europe, N. America, and S. America. These continents are surrounded by the so-called World Ocean, which is broken down into three major bodies: the Atlantic, Pacific, and Indian oceans.
larch
Any of about 10-12 species of coniferous trees that make up the genus Larix of the pine family, native to cool temperate and sub-Arctic regions of the Northern Hemisphere. Though the larch has the pyramid shape typical of conifers, it sheds its short, light-green, needlelike leaves in autumn. The most widespread N. Amer. larch, the tamarack, or eastern larch (L. laricina), matures in 100-200 years, may grow 40-100 ft (12-30 m) tall, and has gray to reddish-brown bark. Coarse-grained, strong, hard, and heavy, larch wood is useful in ship construction and for telephone poles, mine timbers, and railroad ties.
march
Musical form with an even meter with strongly accented beats to facilitate military marching. Development of the European march may have been stimulated by the Ottoman invasions of the 14th-16th cent. Marches were not notated until the late 16th cent.; until then, time was generally kept by percussion alone, often with ...
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