- The
Cretaceous–Paleogene (K–Pg)
extinction event, also
known as the K–T extinction, was the m****
extinction of three-quarters of the
plant and
animal species...
- The
Cretaceous–Paleogene (K–Pg) boundary,
formerly known as the
Cretaceous–Tertiary (K–T) boundary, is a
geological signature,
usually a thin band of rock...
- 19th century, a
significant amount of
research has been
conducted on the
Cretaceous–Paleogene
extinction event, the m****
extinction that
ended the dinosaur-dominated...
- The
climate across the
Cretaceous–Paleogene
boundary (K–Pg or
formerly the K–T boundary) is very
important to
geologic time as it
marks a catastrophic...
-
Fossils are
known since Aptian of the
Early Cretaceous, with
several described species from
Cretaceous amber.
German wasp
Median wasp nest
Polistes nest...
- is an
umbrella term
covering humic acid,
fulvic acid and humin,
which differ in solubility. By definition,
humic acid (HA) is
soluble in
water at neutral...
-
chalky acid acid of
chalk kriedesaeure kohlensaeures gas choke-damp
cretaceous acid Acide mephitique Mephitic air
deutoxide of
carbon hydrocarbonate Water...
- in the
Early Cretaceous,
about 200
million years after the
oldest amber known to date, and they were not
common until the Late
Cretaceous.
Amber becomes...
-
temperatures as high as 2,000 °C (3,630 °F).
Iridium was
discovered in 1803 in the
acid-insoluble
residues of
platinum ores by the
English chemist Smithson Tennant...
- 410 million years.
Coelacanths were
thought to have
become extinct in the Late
Cretaceous,
around 66 million
years ago, but were
discovered living off the coast...
