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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?
Wiki User
∙ 13y ago
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.
Wiki User
∙ 13y ago
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