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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 deep under...
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limestone known as
chalk. The
chalk of
northern France and the
white cliffs of south-eastern
England date from the
Cretaceous Period.
During the Late Cretaceous...
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Cretaceous period.
Today this
formation within the
Chalk Group is
called the West
Melbury Marly Chalk Formation. The
Channel Tunnel was
bored through Chalk Marl...
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Alexander John
Gervase Chalk KC (born 8
August 1976) is a
British politician and
barrister serving as Lord
Chancellor and
Secretary of
State for Justice...
- The
fossil rich
Secondary Pre-Adamitic
period was
divided up into the Coal
period, the Lias and the
Chalk period,
later expanded into the now-familiar...
- Downland, chalkland,
chalk downs or just
downs are
areas of open
chalk hills, such as the
North Downs. This term is used to
describe the characteristic...
- Erasure:
Chalk can be
easily erased,
while whiteboard markings left for an
extended period may
require solvents for removal.
Stain Resistance:
Chalk can be...
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geological period of the
entire Phanerozoic. The name is
derived from the
Latin creta, "
chalk",
which is
abundant in the
latter half of the
period. It is...
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Chalk streams are
rivers that rise from
springs in
landscapes with
chalk bedrock.
Since chalk is permeable,
water percolates easily through the ground...
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derived from the
Latin "creta" (
chalk). It is
abbreviated K (as in "K–Pg boundary") for its
German translation "Kreide" (
chalk). In 1980, a team of researchers...