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The Precambrian Era. The name means: "before the Cambrian period." This old, but still common term was originally used to refer to the whole period of earth's history before the formation of the oldest rocks with recognizable fossils in them. In the last few decades, however, geologists have found that there are some hard-to-discern fossils in some Precambrian rocks, so this period is now also known as the Cryptozoic or "obscure life" Eon (from the words "crypt" = "hidden," and "zoon" = "life").
The Precambrian covers almost 90% of the entire history of the Earth. It has been divided into three eras: the Hadean, the Archean and the Proterozoic.
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The Precambrian Era comprises all of geologic time prior to 600 million years ago. The Precambrian was originally defined as the era that predated the emergence of life in the Cambrian Period. It is now known, however, that life on Earth began by the early Archean and that fossilized organisms became more and more abundant throughout Precambrian time.
The two major subdivisions of the last part of the Precambrian are the Archean (oldest) and the Proterozoic. Rocks younger than 600 Ma are considered part of the Phanerozoic.
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Which gas did volcanoes not produce in the Precambrian era?
Oxygen
What prevents us from finding precambrian fossils?
Most rocks from that era are deeply buried.
The two eras of the Precambrian period are?
Archeozoic and ProterozoicThe two periods of the Cenozoic Era are the Tertiary and the Quatemary.
True or false the first era the precambria era lasted 4 billion year and was the longest era during that time the earth had no solid crust?
It is best to break down the question into smaller parts.1) The Precambrian was the 1st Era? (FALSE)The Precambrian was a super-eon not an era. It was the 1st of the 2 Super-Eons.The 1st named era was the Eoarchean Era (3,800 - 3600 Ma). This was during the Archean Eon (3,800 - 2,500 Ma). This was proceeded by the Hadean Eon (4,600 - 3,800) but no Eras from this time have been named. These were all in the Precambrian Super-Eon (4,600 - 542 Ma).2) The Precambrian was the longest Era? (FALSE)The longest era also occurred in the Precambrian. This was the Paleoproterozoic Era (2,500 - 1,600 Ma) which lasted 900 million years.3) The Precambrian lasted 4 billion years (TRUE)The Precambrian was the longer of the 2 super-eons. It lasted from 4,500 to 542 million years ago, some 3.96 billion years, compared to the current super-eon that has lasted a mere 542 million years.4) During the Precambrian the Earth had no solid crust (FALSE)The Earth is approximately 4,600 million years old. According to the latest theory 4,530 a Mars sized planet called theia hit the earth causing the crust to in part or totally melt (It also gave rise to the moon). Estimates suggest that over the next 30 million years the crust was able to solidify so when the Precambrian Super-Eon started the crust was solid. Certainly by 3,500 million years ago there was life. Fossilized stromatolites have been found at this time. There is no known life that can survive at the temperates necessary for molten rock so the crust must have cooled and solidified by this time.
How long did the romantic era last in fashion?
This period lasted from about 1800-1850.
What was the Precambrian era's climate?
The Precambrian is a long period and just as Earth has many climates now, it had many then.
What geologic era lasted longest?
The Precambrian. Hope this helps! :)
Which describes the correct order of the geologic time scale from oldest to most recent?
ok im going to start off by saying this, the last answerer is stupid, and doesnt know what he is talking about. it goes from: PERIOD ERA EPOCH there you go ;)
Did the precambrian era occur first?
Yes. The first era was the precambrian era followed by the paleozoic era then the mesozoic era than the Cenozoic era.
Historians know least about era do?
**Precambrian**
When was the Founding Era?
the Precambrian era
Where was precambrian era?
it was on earth the precambrian era is an era that happend several million years ago on the earths surface
What was the longest era?
Precambrian
There was no life on land during this era?
Precambrian Era
What are the subdivisions of the Precambrian era?
The Precambrian Era can be divided into three major eras. These eras include the Hadean, the Archean, and the Proterozoic.
What are the chracteristics of the geological era and the definition of precambrian Cenozoic mesozoic and paleozoic?
Precambrian
What era featured the longest periods with no life forms on Earth.?
Precambrian
