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

The meaning of CHALK is a soft white, gray, or buff limestone composed chiefly of the shells of foraminifers. How to use chalk in a sentence.

Oct 10, 2023 · Chalk is a soft, white, porous, sedimentary rock composed primarily of the mineral calcite (calcium carbonate). It is often associated with marine environments and is characterized by its distinctive white color and powdery texture.

Chalk is a biological limestone derived from the tiny calcium carbonate shells of foraminifera and the calcareous remains of marine algae. It is soft, friable, porous, permeable and usually white to light gray in color.

Feb 24, 2025 · Chalk is a common material, found in classrooms, art studios, and even in outdoor games. But have you ever stopped to wonder what exactly chalk is made of and where it originates? This article dives deep into the composition, formation processes, and uses of chalk, revealing the intricate journey from the Earth to your chalkboard.

CHALK definition: 1. a type of soft white rock 2. a stick of this rock or a similar substance used for writing or…. Learn more.

chalk, soft, fine-grained, easily pulverized, white-to-grayish variety of limestone. Chalk is composed of the shells of such minute marine organisms as foraminifera, coccoliths, and rhabdoliths. The purest varieties contain up to 99 percent calcium carbonate in …

Chalk is a type of limestone. It was made by calcareous (CaCO 3) skeletons of tiny planktonic algae called coccoliths. They live in the sea in huge numbers. They make chalk (CO 2) as a by-product of their photosynthesis. The chalk cliffs of Dover and elsewhere were made when England was below the equator in a tropical sea.

CHALK definition: a soft fine-grained white sedimentary rock consisting of nearly pure calcium carbonate ,... | Meaning, pronunciation, translations and examples in American English

Chalk is a very soft kind of rock or limestone. While chalk is made of shells and the skeletons of sea creatures, it's usually found above sea level in pits or quarries. Chalk is made of the element calcium carbonite, and it has agricultural uses, as well as showing up (in tiny amounts) in both toothpaste and antacids.