plate of talc
1metamorphic rock — Any of a class of rocks that result from the alteration of preexisting rocks in response to changing geological conditions, including variations in temperature, pressure, and mechanical stress. The preexisting rocks may be igneous, sedimentary,… …
2igneous rock — Any of various crystalline or glassy, noncrystalline rocks formed by the cooling and solidification of molten earth material (magma). Igneous rocks comprise one of the three principal classes of rocks, the others being metamorphic and sedimentary …
3Precambrian time — Interval of geologic time from с 3. 8 billion years ago, the age of the oldest known rocks, to 544 million years ago, the beginning of the Cambrian Period. This interval represents more than 80% of the geologic record and thus provides important… …
4Ophicalcite — Ophicalce de la vallée d Aoste Une Ophicalce (Brongniart) est une roche carbonatée, appelé aujourd hui ophicalcite . C est un calcaire cristallin composé de calcite et de serpentine …
5Mohs scale of mineral hardness — The Mohs scale of mineral hardness characterizes the scratch resistance of various minerals through the ability of a harder material to scratch a softer material. It was created in 1812 by the German geologist and mineralogist Friedrich Mohs and… …
6Marking out — For other uses, see Marking out (disambiguation). Marking out or layout is the process of transferring a design or pattern to a workpiece, as the first step in the manufacturing process. It is performed in many industries or hobbies although in… …
7Inventions in medieval Islam — A significant number of inventions were developed in the medieval Islamic world, a geopolitical region that has at various times extended from Al Andalus and Africa in the west to the Indian subcontinent and Malay Archipelago in the east.… …
8plat — 1. plat, plate [ pla, plat ] adj. et n. m. • 1080; lat. pop. °plattus, gr. platus « large, étendu » I ♦ Adj. A ♦ (Concret) 1 ♦ Qui présente une surface plane, et spécialt horizontale, ou à peu près plane et horizontale. Les Anciens croyaient que… …
9Saison 2010-2011 du Racing Club de Strasbourg — Saison 2010 2011 du RC Strasbourg …
10geology — /jee ol euh jee/, n., pl. geologies. 1. the science that deals with the dynamics and physical history of the earth, the rocks of which it is composed, and the physical, chemical, and biological changes that the earth has undergone or is… …
