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- Chalk abstract "Chalk /ˈtʃɔːk/ is a soft, white, porous sedimentary rock, a form of limestone composed of the mineral calcite. Calcite is calcium carbonate or CaCO3. It forms under reasonably deep marine conditions from the gradual accumulation of minute calcite plates (coccoliths) shed from micro-organisms called coccolithophores. It is common to find chert or flint nodules embedded in chalk. Chalk can also refer to other compounds including magnesium silicate and calcium sulfate.Chalk has greater resistance to weathering and slumping than the clays with which it is usually associated, thus forming tall steep cliffs where chalk ridges meet the sea. Chalk hills, known as chalk downland, usually form where bands of chalk reach the surface at an angle, so forming a scarp slope. Because chalk is porous it can hold a large volume of ground water, providing a natural reservoir that releases water slowly through dry seasons.Due to its porosity chalk is studied in numerous geophysical experiments (reflection seismology). In the North Sea, experiments have been performed for “evaluating 4D seismic for the correct pore pressure prediction”, through the “stress coefficient of chalk”.".
- Chalk thumbnail The_Needles.jpg?width=300.
- Chalk wikiPageExternalLink chalk.htm.
- Chalk wikiPageExternalLink Landscapes_WhiteRocks.html.
- Chalk wikiPageExternalLink chalk.htm.
- Chalk wikiPageID "44734".
- Chalk wikiPageRevisionID "605184379".
- Chalk caption "The Needles, situated off the Isle of Wight, are part of the extensive Southern England Chalk Formation.".
- Chalk composition "calcite".
- Chalk hasPhotoCollection Chalk.
- Chalk name "Chalk".
- Chalk type "Sedimentary".
- Chalk subject Category:Alchemical_substances.
- Chalk subject Category:Limestone.
- Chalk subject Category:Sedimentary_rocks.
- Chalk subject Category:Sewing_equipment.
- Chalk comment "Chalk /ˈtʃɔːk/ is a soft, white, porous sedimentary rock, a form of limestone composed of the mineral calcite. Calcite is calcium carbonate or CaCO3. It forms under reasonably deep marine conditions from the gradual accumulation of minute calcite plates (coccoliths) shed from micro-organisms called coccolithophores. It is common to find chert or flint nodules embedded in chalk.".
- Chalk label "Chalk".
- Chalk label "Craie".
- Chalk label "Creta (roca)".
- Chalk label "Gesso (roccia)".
- Chalk label "Giz".
- Chalk label "Kreda (skała)".
- Chalk label "Kreide (Gestein)".
- Chalk label "Krijtgesteente".
- Chalk label "Мел".
- Chalk label "チョーク (岩石)".
- Chalk label "白堊岩".
- Chalk sameAs Křída_(hornina).
- Chalk sameAs Kreide_(Gestein).
- Chalk sameAs Creta_(roca).
- Chalk sameAs Klera.
- Chalk sameAs Craie.
- Chalk sameAs Kapur.
- Chalk sameAs Gesso_(roccia).
- Chalk sameAs チョーク_(岩石).
- Chalk sameAs 백악.
- Chalk sameAs Krijtgesteente.
- Chalk sameAs Kreda_(skała).
- Chalk sameAs Giz.
- Chalk sameAs m.0c5q8.
- Chalk sameAs Q183670.
- Chalk sameAs Q183670.
- Chalk wasDerivedFrom Chalk?oldid=605184379.
- Chalk depiction The_Needles.jpg.
- Chalk isPrimaryTopicOf Chalk.
