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Silicon dioxide, also
known as silica, is an
oxide of
silicon with the
chemical formula SiO2,
commonly found in
nature as quartz. In many
parts of the...
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Siliceous rocks are
sedimentary rocks that have
silica (SiO2) as the prin****l constituent. The most
common siliceous rock is chert;
other types include...
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Siliceous ooze is a type of
biogenic pelagic sediment located on the deep
ocean floor.
Siliceous oozes are the
least common of the deep sea sediments,...
- The
siliceous sponges form a
major group of the
phylum Porifera,
consisting of
classes Demospongiae and Hexactinellida. They are
characterized by ****ules...
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Siliceous soils are
formed from
rocks that have
silica (SiO2) as a prin****l constituent. The
parent material of
siliceous soils may
include quartz sands...
- Geyserite, or
siliceous sinter, is a form of
opaline silica that is
often found as
crusts or
layers around hot
springs and geysers.
Botryoidal geyserite...
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Silica gel is an
amorphous and
porous form of
silicon dioxide (silica),
consisting of an
irregular tridimensional framework of
alternating silicon and...
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particles consist primarily of
either the microscopic,
calcareous or
siliceous s**** of
phytoplankton or zooplankton; clay-size
siliciclastic sediment;...
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Angel hair,
siliceous cotton, or Mary's yarn is a sticky,
fibrous substance reported in
connection with UFO sightings, or
manifestations of the Virgin...
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siliceous Porifera, the demosponges.
Their thin
network of
living tissues is
supported by a
characteristic skeleton, a
delicate scaffold of
siliceous...
