Flint

Flint is a hard, sedimentary cryptocrystalline form of the mineral quartz, categorized as a variety of chert. It occurs chiefly as nodules and masses in sedimentary rocks, such as chalks and limestones. Inside the nodule, flint is usually dark grey, black, green, white or brown in colour, and often has a glassy or waxy appearance. A thin layer on the outside of the nodules is usually different in colour, typically white and rough in texture. From a petrological point of view, "flint" refers specifically to the form of chert which occurs in chalk or marly limestone. Similarly, "common chert" (sometimes referred to simply as "chert") occurs in limestone.

Origin

The exact mode of formation of flint is not yet clear but it is thought that it occurs as a result of chemical changes in compressed sedimentary rock formations, during the process of diagenesis. One hypothesis is that a gelatinous material fills cavities in the sediment, such as holes bored by crustaceans or molluscs and that this becomes silicified. This hypothesis certainly explains the complex shapes of flint nodules that are found. The source of dissolved silica in the porous media could be the spicules of silicious sponges. Certain types of flint, such as that from the south coast of England, contain trapped fossilised marine flora. Pieces of coral and vegetation have been found preserved like amber inside the flint. Thin slices of the stone often reveal this effect.

Flint station (Michigan)

Flint is an inter-modal transportation center in Flint, Michigan. It is served by Amtrak's Blue Water route, and doubles as the intercity bus station for Greyhound Lines and Indian Trails, as well as the local city bus service, the Flint Mass Transportation Authority, who owns the station.

Baggage cannot be checked at this location; however, up to two suitcases in addition to any "personal items" such as briefcases, purses, laptop bags, and infant equipment are allowed on board as carry-ons.

History

This is at least the fourth station along the Grand Trunk Western Railroad (GTW) line through Flint. The railroad arrived from Port Huron in 1871 and originally a wooden structure served as the passenger station. A 1905 stone and brick station was moved to Muskegon in 1927. The third GTW depot, located at 120 East 14th Street, was used by Amtrak until 1989 and demolished thereafter. The current station on Dort Highway provides easy access to I-69.

The International Limited was operated jointly by Via Rail and Amtrak between Chicago and Toronto. The service, which had started in 1982, was discontinued in 2004.

Flint (surname)

Flint is a surname. Notable people with the surname include:

Community (ecology)

In ecology, a community or biocoenosis is an assemblage or association of populations of two or more different species occupying the same geographical area and in a particular time. The term community has a variety of uses. In its simplest form it refers to groups of organisms in a specific place or time, for example, "the fish community of Lake Ontario before industrialization".

Community ecology or synecology is the study of the interactions between species in communities on many spatial and temporal scales, including the distribution, structure, abundance, demography, and interactions between coexisting populations. The primary focus of community ecology is on the interactions between populations as determined by specific genotypic and phenotypic characteristics. Community ecology has its origin in European plant sociology. Modern community ecology examines patterns such as variation in species richness, equitability, productivity and food web structure (see community structure); it also examines processes such as predator-prey population dynamics, succession, and community assembly.

Community (season 4)

The fourth season of the television comedy series Community premiered on February 7, 2013 and concluded on May 9, 2013. The season consists of 13 episodes and aired on NBC on Thursdays at 8:00 pm ET as part of the network's "Comedy Night Done Right" programming block.

The season marked the departure of showrunner Dan Harmon and overall received mixed reviews from critics. In the series's fifth season, Harmon returned as showrunner.

Cast

Starring

Episodes

Production

The series was renewed for a fourth season of 13 episodes on May 10, 2012. Season 4 began shooting in August 2012.

Administrative divisions of Armenia

Armenia is subdivided into eleven administrative divisions. Of these, ten are provinces, known as marzer (մարզեր) or in the singular form marz (մարզ) in Armenian.

Yerevan is treated separately and granted special administrative status as the country's capital. The chief executive in each of 10 marzer is the marzpet, appointed by the government of Armenia. In Yerevan, the chief executive is the mayor, appointed by the president.

First-level administrative entities

The following is a list of the regions with population, area, and density information. Figures are from the National Statistical Service of the Republic of Armenia. Note that the area of the Gegharkunik Province includes Lake Sevan which covers 1,278 square kilometres (493 sq mi) of its territory. To sort the information, use the arrow devices in the table headings.

Communities (hamaynkner)

Within each province are communities (hamaynkner, singular hamaynk). Each community is self-governing and consists of one or more settlements (bnakavayrer, singular bnakavayr). Settlements are classified as either towns (kaghakner, singular kaghak) or villages (gyugher, singular gyugh). As of 2007, Armenia includes 915 communities, of which 49 are considered urban and 866 are considered rural. The capital, Yerevan, also has the status of a community. Additionally, Yerevan is divided into twelve semi-autonomous districts.