Search results
Results from the WOW.Com Content Network
Chalk is so common in Cretaceous marine beds that the Cretaceous Period was named for these deposits. The name Cretaceous was derived from Latin creta, meaning chalk. [10] Some deposits of chalk were formed after the Cretaceous. [11] The Chalk Group is a European stratigraphic unit deposited during the late Cretaceous Period.
The Chalk Group (often just called the Chalk) is the lithostratigraphic unit (a certain number of rock strata) which contains the Upper Cretaceous limestone succession in southern and eastern England.
The density of limestone depends on its porosity, which varies from 0.1% for the densest limestone to 40% for chalk. The density correspondingly ranges from 1.5 to 2.7 g/cm 3 . Although relatively soft, with a Mohs hardness of 2 to 4, dense limestone can have a crushing strength of up to 180 MPa . [ 13 ]
Chelsea is an English given name derived from the Old English place name ċealc hȳð, [1] or the modern Celcyth, meaning chalk landing place. The name evolved to Chelsea, a location on the River Thames that became a London borough known for its wealthy, socially influential residents. Many locations have been named after the English place name ...
The National Trust, which owns the surrounding areas, plans to return the land to a natural state of chalk grassland and preserve existing military structures from the Second World War. [35] In June 2021, a wildflower meadow on White Cliffs of Dover was named in honour of Dame Vera Lynn.
The exact origin of the word Bangla is unknown, though it is believed to come from "Vanga", an ancient kingdom mentioned in world's largest Epic Mahabharat even Ramayan and geopolitical division on the Ganges delta in the Indian subcontinent. It was located in southern Bengal, with the core region including present-day southern West Bengal ...
Since the war began in 2011, Assad's army command had come to depend on allied Iranian and Iran-funded Lebanese and Iraqi forces to provide the best fighting units in Syria, all the senior sources ...
Flint, occasionally flintstone, is a sedimentary cryptocrystalline form of the mineral quartz, [1] [2] categorized as the variety of chert that occurs in chalk or marly limestone. Historically, flint was widely used to make stone tools and start fires. Flint occurs chiefly as nodules and masses in sedimentary rocks, such as chalks and limestones.