rock intercalation

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• Graphite — For other uses, see Graphite (disambiguation). Graphite Graphite specimen General Category Native element mineral …   Wikipedia

• Egypt — • Provides information on history, religion, and literature Catholic Encyclopedia. Kevin Knight. 2006. Egypt     Egypt     † …   Catholic encyclopedia

• Geologic time scale — This clock representation shows some of the major units of geological time and definitive events of Earth history. The Hadean eon represents the time before fossil record of life on Earth; its upper boundary is now regarded as 4.0 Ga.[1] Other… …   Wikipedia

• Thalidomide — This article is about the drug. For the musical about a person with thalidomide disability, see Thalidomide!! A Musical. Thalidomide Systematic (IUPAC) name (RS) 2 (2,6 dioxopiperidin 3 yl) 1H isoind …   Wikipedia

• Pirke De-Rabbi Eliezer — (Aramaic: פרקי דרבי אליעזר) is a aggadic midrashic work on Genesis, part of Exodus, and a few sentences of Numbers, ascribed to R. Eliezer ben Hyrcanus, and composed shortly after 833 CE. It is quoted immediately before the end of the 12th… …   Wikipedia

• Devonian Period — Interval of geologic time from 417 to 354 million years ago; it was the fourth period of the Paleozoic Era. During the Devonian, a giant continent was situated in the Southern Hemisphere (see Gondwana), and other landmasses were located in the… …   Universalium

• Carbide — For the software development tool targeting the Symbian OS, see Carbide.c++. Calcium carbide. In chemistry, a carbide is a compound composed of carbon and a less electronegative element. Carbides can be generally classified by chemical bonding… …   Wikipedia

• Dating methodologies in archaeology — Dating material drawn from the archaeological record can be made by a direct study of an artifact or may be deduced by association with materials found in the context the item is drawn from or inferred by its point of discovery in the sequence… …   Wikipedia

• Dreamtime — This article is about the Australian Aboriginal mythological era. For other uses, see Dreamtime (disambiguation). In the animist framework of Australian Aboriginal mythology, The Dreaming is a sacred era in which ancestral Totemic Spirit Beings… …   Wikipedia

• Geochronology — A schematic depiction of the major events in the history of our planet. Geochronology is the science of determining the age of rocks, fossils, and sediments, within a certain degree of uncertainty inherent to the method used. A variety of dating… …   Wikipedia

• Yttrium — (pronEng|ˈɪtriəm) is a chemical element with symbol Y and atomic number 39. It is a silvery metallic transition metal chemically similar to the lanthanoids and has historically been classified as a rare earth element. Yttrium is almost always… …   Wikipedia