chalk overlay - meaning and definition. What is chalk overlay
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What (who) is chalk overlay - definition

SOFT, WHITE, POROUS SEDIMENTARY ROCK
Chalk pit; Tailor's chalk; Black chalk; Chalkstone; Pavement chalk; Chalk rock; Chalk (rock); Chalk stick
  • Former underground [[chalk mine]] in [[Meudon]], France
  • Child drawing with [[sidewalk chalk]]
  • Chalk from the White Cliffs of Dover, England
  • Chalk in different colors
  • "Nitzana Chalk curves" situated at Western [[Negev]], [[Israel]], are chalk deposits formed in the [[Mesozoic]] era's [[Tethys Ocean]]
  • Open chalk pit, Seale, Surrey, UK

Overlay plan         
METHOD OF AREA CODE RELIEF FOR AN EXHAUSTED CODE
Area code overlay; Overlay area code; Overlay complex
In telecommunications, an overlay plan is a telephone numbering plan that assigns multiple area codes to a geographic numbering plan area (NPA). Overlaying numbering plan area codes is practiced in territories of the North American Numbering Plan (NANP) to prevent exhaustion of telephone numbers and central office codes in growth areas.
O. Roy Chalk         
AMERICAN BUSINESSMAN
Roy chalk
Oscar Roy Chalk (June 7, 1907 – December 1, 1995) was a New York entrepreneur who owned real estate, airlines, bus companies, newspapers and a rail line that hauled bananas in Central America. His diverse holdings included DC Transit, Trans Caribbean Airways, the Houdon bust of Thomas Jefferson now at Monticello, the Chalk Emerald, and the New York Spanish-language newspapers El Diario de Nueva York and La Prensa, merging them into El Diario La Prensa.
chalk         
(chalks, chalking, chalked)
1.
Chalk is a type of soft white rock. You can use small pieces of it for writing or drawing with.
...the highest chalk cliffs in Britain...
Her skin was chalk white and dry-looking.
N-UNCOUNT: oft N n
2.
Chalk is small sticks of chalk, or a substance similar to chalk, used for writing or drawing with.
...somebody writing with a piece of chalk.
...drawing a small picture with coloured chalks.
N-UNCOUNT: also N in pl
3.
If you chalk something, you draw or write it using a piece of chalk.
He chalked the message on the blackboard...
There was a blackboard with seven names chalked on it.
VERB: V n, V-ed
4.
If you say that two people or things are like chalk and cheese, you are emphasizing that they are completely different from each other. (BRIT)
The two places, he insists, are as different as chalk and cheese...
We are very aware of our differences, we accept that we are chalk and cheese.
PHRASE [emphasis]

Wikipedia

Chalk

Chalk is a soft, white, porous, sedimentary carbonate rock. It is a form of limestone composed of the mineral calcite and originally formed deep under the sea by the compression of microscopic plankton that had settled to the sea floor. Chalk is common throughout Western Europe, where deposits underlie parts of France, and steep cliffs are often seen where they meet the sea in places such as the Dover cliffs on the Kent coast of the English Channel.

Chalk is mined for use in industry, such as for quicklime, bricks and builder's putty, and in agriculture, for raising pH in soils with high acidity. It is also used for "blackboard chalk" for writing and drawing on various types of surfaces, although these can also be manufactured from other carbonate-based minerals, or gypsum.