Chalk - Wikipedia
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Chalk vs Limestone
Chalk is a soft, friable and porous variety of limestone. Chalk is composed of calcareous tests of marine microo… | Rock types, Rocks and minerals, Rock and pebbles
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Chalk
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Chalk: A biological limestone formed from shell debris
![Zoölogy [microform] : descriptive and practical. Zoology; Zoologie. Protozoa. 199 tons slowly settle to the bottom. Dredgings from the bottom of the Atlantic Ocean contain a gray mud which, under the](https://c8.alamy.com/comp/RENCHX/zology-microform-descriptive-and-practical-zoology-zoologie-protozoa-199-tons-slowly-settle-to-the-bottom-dredgings-from-the-bottom-of-the-atlantic-ocean-contain-a-gray-mud-which-under-the-microscope-is-found-to-be-largely-composed-of-these-shells-so-where-we-find-chalk-rock-on-land-we-know-that-region-was-once-the-bed-of-the-ocean-this-once-soft-mud-has-become-hardened-by-drying-or-by-pressure-sometimes-by-both-into-hard-rock-a-variety-of-limestone-known-as-chalk-a-genemtion-ago-the-car-wfw-fig-174-a-shell-bearing-protozoan-globigerina-from-packard-penter-and-RENCHX.jpg "Zoölogy [microform] : descriptive and practical. Zoology; Zoologie. Protozoa. 199 tons slowly settle to the bottom. Dredgings from the bottom of the Atlantic Ocean contain a gray mud which, under the")
Zoölogy [microform] : descriptive and practical. Zoology; Zoologie. Protozoa. 199 tons slowly settle to the bottom. Dredgings from the bottom of the Atlantic Ocean contain a gray mud which, under the
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Chalk - Wikipedia
Chalk: A biological limestone formed from shell debris
