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potentially valuable element

См. также в других словарях:

  • chemical element — Introduction also called  element,         any substance that cannot be decomposed into simpler substances by ordinary chemical processes. Elements are the fundamental materials of which all matter is composed.       This article considers the… …   Universalium

  • actinide element — ▪ chemical element group Introduction       any of a series of 15 consecutive chemical elements in the periodic table from actinium to lawrencium (atomic numbers 89–103). As a group they are significant largely because of their radioactivity.… …   Universalium

  • Rare earth element — Rare earth ore, shown with a United States penny for size comparison These rare …   Wikipedia

  • ancient Greek civilization — ▪ historical region, Eurasia Introduction       the period following Mycenaean civilization, which ended in about 1200 BC, to the death of Alexander the Great, in 323 BC. It was a period of political, philosophical, artistic, and scientific… …   Universalium

  • Australia — /aw strayl yeuh/, n. 1. a continent SE of Asia, between the Indian and the Pacific oceans. 18,438,824; 2,948,366 sq. mi. (7,636,270 sq. km). 2. Commonwealth of, a member of the Commonwealth of Nations, consisting of the federated states and… …   Universalium

  • space exploration — Investigation of the universe beyond Earth s atmosphere by means of manned and unmanned spacecraft. Study of the use of rockets for spaceflight began early in the 20th century. Germany s research on rocket propulsion in the 1930s led to… …   Universalium

  • Foreign internal defense — (FID) is used by a number of Western militaries, explicitly by the United States but sharing ideas with countries including France and the United Kingdom, to describe an approach to combating actual or threatened insurgency in a foreign state… …   Wikipedia

  • sonata — /seuh nah teuh/, n. Music. a composition for one or two instruments, typically in three or four movements in contrasted forms and keys. [1685 95; < It < L sonata, fem. of sonatus (ptp. of sonare to SOUND1). See SONANT, ATE1] * * * I Musical form… …   Universalium

  • Law, Crime, and Law Enforcement — ▪ 2006 Introduction Trials of former heads of state, U.S. Supreme Court rulings on eminent domain and the death penalty, and high profile cases against former executives of large corporations were leading legal and criminal issues in 2005.… …   Universalium

  • Green Architecture: Building for the 21st Century — ▪ 2008 Introduction James Wines       Green design was a pervasive topic in boardrooms and living rooms in 2007, particularly as the costs of maintaining the status quo became apparent. The building of shelter (in all its forms) consumes more… …   Universalium

  • Congo River — The Congo River River The Congo River near Mossaka …   Wikipedia

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