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Why is PreCambrian called PreCambrian?
Precambrian is BEFORE the Cambrian period!
The largest division of geological time is called?
The Archean Eon, which is part of the Precambrian period along with the Proterozoic Eon.
What era featured the longest periods with no life forms on Earth.?
Precambrian
What is the largest geological time division?
The Precambrian.
What are the four division of geological time?
Cenozoic Mesozoic Paleozoic Precambrian
What is the significance of the didvision between the Cambrian and PreCambrian periods?
During the Cambrian period, life began to appear on the planet.
Why is PreCambrian called PreCambrian?
Precambrian is BEFORE the Cambrian period!
What is the difference between the Cambrian and preCambrian periods?
The difference between The differeence between the Cambrian and Pre-Cambrian is that the Cambrian fossils are ones of hard shell creatures because of thee evolved predators. The difference between Cambrian and Pre-Cambrian is that the Cambrian fossils are ones of hard shell creatures because of the evolved predators.rian fossils Cambrian and Pre-Cambrian is that the Cambrian fossils are ones of hard shell creatures because of the evolved predators.
The largest division of geological time is called?
The Archean Eon, which is part of the Precambrian period along with the Proterozoic Eon.
How many periods are in each era?
there are different periods in each era. In the Cenozoic era, there are 2 periods, Quaternary and Tertiary. Mesozoic era has 3 periods, Cretaceous, Jurassic, and Triassic. Paleozoic has 7 periods, Permian, Carboniferous, Devonian, Silurian, Ordovician, and Cambrian. Precambrian is just the present, no time periods in it.
What three divisions make up the geological timetable?
Precambrian Cambrian
What are the major subdivisions of geologic times?
The major subdivisions are the Precambrian, Palaeozoic, Mesozoic and Cenozoic, which are subdivided into Archean and Proterozoic (Precambrian), Cambrian, Ordovician, Silurian, Devonian, Carboniferous (or Missisipian and Pennsylvanian in the US) and Permian (Palaeozoic), Triassic, Jurassic and Cretaceous (Mesozoic) and Tertiary and Quaternary (Cenozoic). For a graphical representation, see http://geomaps.wr.usgs.gov/socal/geology/geologic_history/images/geologic_time_scale.jpg
The major divisions in geologic time are?
Precambrian Paleozoic: -cambrian -ordovician -silurian -devonian -mississippian -pennsylvanian -permian Mezozoic: -triassic -jurassic -cretaceous Cenozoic: -tertiary -quaternary
What era featured the longest periods with no life forms on Earth.?
Precambrian
What is meant by term Cambrian explosion?
The Cambrian explosion is an apparently sudden increase in fossils marking the separation between Precambrian rocks and Cambrian rocks. At one time this was believed to mark the beginning of multicellular life, but in fact it only marks the evolution of hard body parts (most of which were made of calcium carbonate). It turns out that there were as many multicellular organisms in the late Precambrian as there were during the Cambrian explosion at the beginning of the Cambrian, but the lack of hard body parts in those organisms made the formation of easy to identify fossils of those organisms much rarer.
What are the periods that make up the precambrian Era?
4,028,000,000 years.
Animals in the preCambrian period?
The group of animalia (animals) did not fully form until the Cambrian period. There is evidence of simple life (single-celled) and small multi-celled life forms from before the Cambrian explosion.
