Chalk vs. Sandstone

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Chalknoun

(uncountable) A soft, white, powdery limestone.

Chalknoun

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

Chalknoun

Tailor's chalk.

Chalknoun

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

Chalknoun

A platoon-sized group of airborne soldiers.

Chalknoun

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

Chalkverb

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

Chalkverb

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

Chalkverb

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

Chalkverb

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

Chalkverb

To manure (land) with chalk.

Chalkverb

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

Chalknoun

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

Chalknoun

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.

Chalkverb

To rub or mark with chalk.

Chalkverb

To manure with chalk, as land.

Chalkverb

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

Chalknoun

a soft whitish calcite

Chalknoun

a pure flat white with little reflectance

Chalknoun

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

Chalknoun

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

Chalkverb

write, draw, or trace with chalk

Chalknoun

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

Chalknoun

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

Chalknoun

a series of strata consisting mainly of chalk.

Chalknoun

short for French chalk

Chalkverb

write or draw with chalk

Chalkverb

draw or write on (a surface) with chalk

Chalkverb

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

Chalkverb

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

Chalk

Chalk is a soft, white, porous, sedimentary carbonate rock, a form of limestone composed of the mineral calcite and originally formed deep under the sea by the compression of microscopic plankton which had fallen 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.

Sandstonenoun

A sedimentary rock produced by the consolidation and compaction of sand, cemented with clay etc.

Sandstonenoun

A rock made of sand more or less firmly united. Common or siliceous sandstone consists mainly of quartz sand.

Sandstonenoun

a sedimentary rock consisting of sand consolidated with some cement (clay or quartz etc.)

Sandstone

Sandstone is a clastic sedimentary rock composed mainly of sand-sized (0.0625 to 2 mm) silicate grains. Sandstones comprise about 20–25% of all sedimentary rocks.Most sandstone is composed of quartz or feldspar (both silicates) because they are the most resistant minerals to weathering processes at the Earth's surface, as seen in the Goldich dissolution series.

Chalk Illustrations

Sandstone Illustrations

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