Chapter 11 Flashcards

Extinction event
Terms Definitions
earth is approximately how old?
4.57 billion years
the headean is a time in earth history when
earths interior was so hot that a solid outer crust, if present, was likely being extensively remelted
the cambrian period is a time in earth history when
the dinosaurs appeared and came to dominate large-scale terrestrial life
toward the end of the archean eon _____
stable continental interiors, termed cratons, first formed
which gas found in todays atmosphere was virtually absent in the headeans and archeans?
oxygen
greenhouse climate on earth was associated with relatively high atmospheric levels of shich gas?
carbon dioxide
a crustal rock dated to 150 Ma is how old?
150 million years
the himalayas were produced by the collision of _____ with southern asia during the cenozoic
india
dinosaurs first appeared during the _____ period
triassic
the first mammals appeared during the _____ period
triassic
the eon represented by abundant deposits of strata with shelly fossils is the
phanerozoic
toward the end of the archean eon _____
stable continental interiors, termed cratons, first formed
a shield is _____
a low-lying region where precambrian rocks crop out
a cratonic platform is
a low-lying region where precambrian rocks are covered by phanerozoic sedimentary strata
geographically, a shield and surrounding platform together are
synonymous with "craton"
a fold-thrust belt is
a region of compressed rock located behind a volcanic arc at a convergent continental margin
the earliest forests containing woody trees appeared during the _____
middle paleozoic (in the devonian period)
tree-sized relatives of the living ferns, club mosses, and scouring rushes were common in environments termed coal swamps during the _____ period
carboniferous
the western interior seaway reached its greatest level of continental inundation during the _____ period
cretaceous
tyrannosaurus rex, one of the largest carnivorous dinosaur species, lived during the _____ period
cretaceous
the cretaceous-tertiary (K-T) boundary event took place how many millions of years ago?
65
An iridium-rich layer of clay, glass spherules, and shocked quartz grains strongly suggests that the K-T boundary extinctions were at least in part caused by
the impact of a bolide (meteoroid or comet)
The most recent interval of Quaternary glaciation gave way to warmer, interglacial conditions ____________ ago.
11,000 years
When did the human genus, Homo first appear on Earth?
2.4 million years ago
Humans belong to a lineage of mammals called the
primates
Earth became internally differentiated, with a metallic core distinct from the rocky mantle, during the
hadean eon
The generally accepted scientific theory for the origin of our Moon involves
impact between Earth and a Mars-sized body during the Hadean
Earth was hotter than today during the Hadean for all of the following reasons EXCEPT
the Sun was much more luminous than it is today
Oxygen in Earth's atmosphere is derived from
photosynthesis
The end of the Cretaceous Period (extinction of dinosaurs and many other groups) represents the only evidence we have in the fossil record of a catastrophic mass extinction. true or false?
false
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