Soft, white, porous, sedimentary carbonate rock.- Chalk
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A blackboard (also known as a chalkboard) is a reusable writing surface on which text or drawings are made with sticks of calcium sulphate or calcium carbonate, known, when used for this purpose, as chalk.
Geological period that lasted from about 145 to 66 million years ago .
The name is derived from the Latin creta, "chalk", which is abundant in the latter half of the period.
Sedimentary cryptocrystalline form of the mineral quartz, categorized as the variety of chert that occurs in chalk or marly limestone.
It occurs chiefly as nodules and masses in sedimentary rocks, such as chalks and limestones.
Material with high plasticity, similar in texture to clay or dough, typically used in domestic construction and repair as a sealant or filler.
Glazing putty is traditionally made by mixing a base of whiting (finely ground chalk) with linseed oil in various proportions.
Lithostratigraphic unit (a certain number of rock strata) which contains the Upper Cretaceous limestone succession in southern and eastern England.
It is characterised by thick deposits of chalk, a soft porous white limestone, deposited in a marine environment.
Best known for the production of champagne, the sparkling white wine that bears the region's name.
Ancient oceans left behind chalk subsoil deposits when they receded 70 million years ago.
Strait at the narrowest part of the English Channel, marking the boundary between the Channel and the North Sea, separating Great Britain from continental Europe.
The predominant geology on both the British and French sides and on the seafloor is chalk.
Region of English coastline facing the Strait of Dover and France.
The cliff face, which reaches a height of 350 ft, owes its striking appearance to its composition of chalk accented by streaks of black flint, deposited during the Late Cretaceous.
Carbonate mineral and the most stable polymorph of calcium carbonate .
It is thus etymologically related to chalk.
Small, irregularly rounded knot, mass, or lump of a mineral or mineral aggregate that typically has a contrasting composition, such as a pyrite nodule in coal, a chert nodule in limestone, or a phosphorite nodule in marine shale, from the enclosing sediment or sedimentary rock.
Chert and flint nodules are often found in beds of limestone and chalk.