These women were called concubines, and they often were treated better than the manâs wife. The word concubine comes from the Latin verb, cubare, which means to lie down. The word developed in Middle English in the 13th Century, and is another name for a woman taken as a mistress. The practice was common throughout history: the Bible includes many references to concubines, and in ancient China, a ruler might have had thousands of concubines, some treated well, some like prostitutes.
Sedimentary rocks are formed when sediment is deposited out of air, ice, wind, gravity, or water flows carrying the particles in suspension. This sediment is often formed when weathering and erosion break down a rock into loose material in a source area.The material is then transported from the source area to the deposition area. The type of sediment transported depends on the geology of the hinterland (the source area of the sediment).he sedimentary rock cover of the continents of the Earth's crust is extensive, but the total contribution of sedimentary rocks is estimated to be only 8% of the total volume of the crust. Sedimentary rocks are only a thin veneer over a crust consisting mainly of igneous and metamorphic rocks.
1) Clastic (or detrital) sedimentary rocks-Form from the cementation of sediment grains that come from pre-existing rocks. This is the most common sedimentary rock type. Clastic sedimentary rocks are classified by grain size, and to a lesser extent by chemical composition.