Flint is a hard, sedimentarycryptocrystalline form of the mineralquartz, 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.
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.
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.
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.
Library is a station on the Port Authority of Allegheny County's light rail network, located in the Library neighborhood of South Park, Pennsylvania. It is the southern terminus of the Library branch of the Blue Line. A 430 space park and ride lot is located on the premises, drawing travelers from both South Park and Pittsburgh's suburbs in Washington County, located just to the south. Despite the station's name there is no lending library near the train station, in the past many riders have been confused into thinking there was an actual library there.
The Pittsburgh Railwaysinterurban line from Charleroi to Pittsburgh was opened through South Park on September 12, 1903, with passengers changing at Castle Shannon to continue their journey to Downtown via the Pittsburgh and Castle Shannon Railroad. It was cut back to Library in 1953, with a turnaround loop for the single-ended PCC's that operated on the line. In the late 1980s, new light rail vehicles began to use the line. These new cars had larger, articulated bodies, and were thus unable to negotiate the loop. Moreover, these cars were double-ended, eliminating the need for such turn-around facilities. In 2004, the loop was removed and a new, larger station was built to better accommodate the light rail cars.
Halo rings are fictional megastructures and superweapons in the Halo video game series, giving its name. They are referred to as "Installations" by their AI monitors, and are collectively referred to as "the Array" by the installations' creators, the Forerunners. The series' alien antagonists, the Covenant, refer to the structures as the "Sacred Rings", believing them to form part of a greater religious prophecy known as "The Great Journey". According to Halo's fiction, the Forerunners built the rings to contain and study the Flood, an infectious alien parasite. The rings act together as a weapon of last resort; when fired, the rings kill any sentient life capable of falling prey to the Flood, starving the parasite of its food. The installations are at the crux of the plot progression for the Halo series.
The Halos are massive ringworlds, which feature their own wildlife and weather. The constructs resemble Larry Niven's Ringworld concept in shape and design. The structure that Halo: Combat Evolved takes place on was initially to be a hollowed-out planet, but was changed to its ring design later in development; a staff member provided "Halo" as the name for both the ring and the video game after names such as Red Shift were suggested.