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Chalk is a soft, white, porous, sedimentary carbonate rock. It is a form of limestone composed of the mineral calcite and originally formed under the sea by the accumulation and lithification of hard parts of organisms, mostly microscopic plankton, which 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.
AI overview
Chalk is a soft, white, porous rock made of calcite that formed from the accumulated shells and hard parts of tiny sea creatures compressed over millions of years. It is commonly found in Western Europe, where it creates distinctive white cliffs, such as the famous Dover cliffs in England, where it meets the sea.
AI-generated from the Wikipedia summary — may contain errors.
Key facts
- Rock.name
- Chalk
- Rock.type
- Sedimentary
- Rock.image
- Seven Sisters 3.jpg
- Rock.caption
- Beachy Head is a part of the extensive Southern England Chalk Formation.
- Rock.composition
- Calcite (calcium carbonate)
via Wikipedia infobox
Wikidata facts
- Image
- Chalk (25800474082).jpg
Show 4 more facts
- Commons category
- Chalk
- Commons gallery
- Chalk
- 2022 Harmonized System Code
- 250900
- exact match