Chalk vs. Keel - What's the difference?

Main Difference

The main difference between Chalk and Keel is that the Chalk is a soft, white, porous sedimentary rock and Keel is a structural element of a ship hull, or boat hull.

Wikipedia

  • Chalk

    Chalk ( ) is a soft, white, porous, sedimentary carbonate rock, a form of limestone composed of the mineral calcite. Calcite is an ionic salt called calcium carbonate or CaCO3. It forms under reasonably deep marine conditions from the gradual accumulation of minute calcite shells (coccoliths) shed from micro-organisms called coccolithophores. Flint (a type of chert) is very common as bands parallel to the bedding or as nodules embedded in chalk. It is probably derived from sponge spicules or other siliceous organisms as water is expelled upwards during compaction. Flint is often deposited around larger fossils such as Echinoidea which may be silicified (i.e. replaced molecule by molecule by flint). Chalk as seen in Cretaceous deposits of Western Europe is unusual among sedimentary limestones in the thickness of the beds. Most cliffs of chalk have very few obvious bedding planes unlike most thick sequences of limestone such as the Carboniferous Limestone or the Jurassic oolitic limestones. This presumably indicates very stable conditions over tens of millions of years. 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 well jointed it can hold a large volume of ground water, providing a natural reservoir that releases water slowly through dry seasons.

  • Keel

    On boats and ships, the keel is either of two parts: a structural element that sometimes resembles a fin and protrudes below a boat along the central line, or a hydrodynamic element. These parts overlap. As the laying down of the keel is the initial step in the construction of a ship, in British and American shipbuilding traditions the construction is dated from this event. Only the ship's launching is considered more significant in its creation. The word can also be used as a synecdoche to refer to a complete boat, such as a keelboat.

Wiktionary

  • Chalk (noun)

    A soft, white, powdery limestone.

  • Chalk (noun)

    A piece of chalk, or nowadays processed compressed gypsum, that is used for drawing and for writing on a blackboard.

  • Chalk (noun)

    Tailor's chalk.

  • Chalk (noun)

    A white powdery substance used to prevent hands slipping from holds when climbing, sometimes but not always limestone-chalk.

  • Chalk (noun)

    A platoon-sized group of airborne soldiers.

  • Chalk (noun)

    The prediction that there will be no upsets, and the favored competitor will win.

  • Chalk (verb)

    To apply chalk to anything, such as the tip of a billiard cue.

  • Chalk (verb)

    To record something, as on a blackboard, using chalk.

  • Chalk (verb)

    To use powdered chalk to mark the lines on a playing field.

  • Chalk (verb)

    To record a score or event, as if on a chalkboard.

  • Chalk (verb)

    To manure (land) with chalk.

  • Chalk (verb)

    To make white, as if with chalk; to make pale; to bleach.

Oxford Dictionary

  • Chalk (noun)

    a white soft earthy limestone (calcium carbonate) formed from the skeletal remains of sea creatures.

  • Chalk (noun)

    a substance (calcium sulphate) that is similar to chalk, made into white or coloured sticks for writing or drawing.

  • Chalk (noun)

    a series of strata consisting mainly of chalk.

  • Chalk (noun)

    short for French chalk

  • Chalk (verb)

    write or draw with chalk

    "he chalked a message on the board"

  • Chalk (verb)

    draw or write on (a surface) with chalk

    "blackboards chalked with Japanese phrases"

  • Chalk (verb)

    rub the tip of (a snooker cue) with chalk.

  • Chalk (verb)

    charge (drinks bought in a pub or bar) to a person's account

    "he chalked the bill on to the Professor's private account"

  • Keel (noun)

    the lengthwise timber or steel structure along the base of a ship, supporting the framework of the whole, in some vessels extended downwards as a ridge to increase stability.

  • Keel (noun)

    a ship

    "to buy a new keel with my gold, And fill her with such things as she may hold"

  • Keel (noun)

    a ridge along the breastbone of many birds to which the flight muscles are attached; the carina.

  • Keel (noun)

    a prow-shaped pair of petals present in flowers of the pea family.

  • Keel (noun)

    a flat-bottomed boat of a kind formerly used on the Tyne and Wear Rivers for loading ships carrying coal.

  • Keel (verb)

    (of a boat or ship) turn over on its side; capsize

    "it's going to take more wind to make this boat keel over"

  • Keel (verb)

    (of a person or thing) fall over; collapse

    "a wardrobe was about to keel over on top of him"

Webster Dictionary

  • Chalk (noun)

    A soft, earthy substance, of a white, grayish, or yellowish white color, consisting of calcium carbonate, and having the same composition as common limestone.

  • Chalk (noun)

    Finely prepared chalk, used as a drawing implement; also, by extension, a compound, as of clay and black lead, or the like, used in the same manner. See Crayon.

  • Chalk

    To rub or mark with chalk.

  • Chalk

    To manure with chalk, as land.

  • Chalk

    To make white, as with chalk; to make pale; to bleach.

  • Keel

    To cool; to skim or stir.

  • Keel (noun)

    A brewer's cooling vat; a keelfat.

  • Keel (noun)

    A longitudinal timber, or series of timbers scarfed together, extending from stem to stern along the bottom of a vessel. It is the principal timber of the vessel, and, by means of the ribs attached on each side, supports the vessel's frame. In an iron vessel, a combination of plates supplies the place of the keel of a wooden ship. See Illust. of Keelson.

  • Keel (noun)

    Fig.: The whole ship.

  • Keel (noun)

    A barge or lighter, used on the Tyne for carrying coal from Newcastle; also, a barge load of coal, twenty-one tons, four cwt.

  • Keel (noun)

    The two lowest petals of the corolla of a papilionaceous flower, united and inclosing the stamens and pistil; a carina. See Carina.

  • Keel (noun)

    A projecting ridge along the middle of a flat or curved surface.

  • Keel (noun)

    In a dirigible, a construction similar in form and use to a ship's keel; in an aëroplane, a fin or fixed surface employed to increase stability and to hold the machine to its course.

  • Keel (verb)

    To traverse with a keel; to navigate.

  • Keel (verb)

    To turn up the keel; to show the bottom.

Princeton's WordNet

  • Chalk (noun)

    a soft whitish calcite

  • Chalk (noun)

    a pure flat white with little reflectance

  • Chalk (noun)

    amphetamine used in the form of a crystalline hydrochloride; used as a stimulant to the nervous system and as an appetite suppressant

  • Chalk (noun)

    a piece of chalk (or similar substance) used for writing on blackboards or other surfaces

  • Chalk (verb)

    write, draw, or trace with chalk

  • Keel (noun)

    the median ridge on the breastbone of birds that fly

  • Keel (noun)

    one of the main longitudinal beams (or plates) of the hull of a vessel; can extend vertically into the water to provide lateral stability

  • Keel (verb)

    walk as if unable to control one's movements;

    "The drunken man staggered into the room"

Illustrations

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