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.
A match is a tool for starting a fire. Typically, modern matches are made of small wooden sticks or stiff paper. One end is coated with a material that can be ignited by frictional heat generated by striking the match against a suitable surface. Wooden matches are packaged in matchboxes, and paper matches are partially cut into rows and stapled into matchbooks. The coated end of a match, known as the match "head", consists of a bead of active ingredients and binder; often coloured for easier inspection. There are two main types of matches: safety matches, which can be struck only against a specially prepared surface, and strike-anywhere matches, for which any suitably frictional surface can be used. Some match-like compositions, known as electric matches, are ignited electrically and do not make use of heat from friction.
Historically, the term match referred to lengths of cord (later cambric) impregnated with chemicals, and allowed to burn continuously. These were used to light fires and fire guns (see matchlock) and cannons (see linstock). Such matches were characterised by their burning speed i.e. quick match and slow match. Depending on its formulation, a slow match burns at a rate of around 30cm (1ft) per hour and a quick match at 4 to 60 centimetres (1.6 to 23.6in) per minute.
England struggled against the well organised and physically imposing Tunisian defence in their first match of the tournament ... Here is all you need to know about when and where to watch World Cupmatches being played on 24 June.. When and where will the matches be played?. The three matches scheduled to be played on 24 June are England vs Panama, Japan vs Senegal and PolandColombia ... How do I watch the matches live?....
After Belgium’s 5-2 win over Tunisia on Saturday, the 64-year-old record for the maximum number of matches without a goalless draw in a World Cup was broken. There were no goalless draws in all the 26 matches played in the 1954 World Cup in Switzerland, but after Eden Hazard struck the first goal for Belgium in Moscow, this year’s tally reached 27....