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Q: Archean and the Proterozoic Eons make up what?
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Is the Mesozoic Era the longest?

The answer is NOOOO!!!! It is not the longest Era!!! The Precambrian consisted of the Archean and Proterozoic Eras which each pull roughly 2 billion years of geologic time making up the first 4 billion years of Earth. The Archean from 4.5 Billion Years Ago to about 2.5 BYA and the Proterozoic from 2.5 BYA to about 570 MYA. The Paleozoic which preceded the Mesozoic lasted about 345 Million years (570 MYA- 225 MYA) and the Mesozoic lasted about 215 Million years (225 MYA- 65 MYA).


What geologic period lasted for almost 7 8ths of earth's history?

The geological division that lasted for just over 7/8ths of the Earth's history is the Precambrian Super-Eon. It started 4576.2 million years ago with the formation of Earth and ended 542 million years ago at the start of the Cambrian Period. It is made up of the Hadean, Archean and Proterozoic Eons. Although the super-eon is widely recognised as a time division this is only an unofficial term. The ICS prefer to use the Eon when describing the time before the Cambrian.


What events marks the beginning of the precambrian era?

The Precambrian Era began with the formation of Earth around 4600 Ma (million years ago). It extends to the beginning of the Cambrian Period, about 542 Ma, when macroscopic hard-shelled animals first appeared in abundance. It lasted 4 billion years, and makes up about 88% of Earth's geological time. The Precambrian is technically divided into three eons: - Hadean (4500-3950 Ma) - Archean (3950-2500 Ma) - Proterozoic (2500-542 Ma)


When do the first eukaryotic cells show up in the fossil record?

65 miliion years


What major change occurred in the life forms at the end of proterozoic?

The middle Proterozoic comes the first evidence of oxygen build up in the atmosphere. This is how the eukaryotes formed. They include multicellular algae.


In science how long is an eon?

An eon is a made up of two or more eras. They are defined in terms of what was happening on the planet in biological and geological terms rather than in number of years. We are now 541 million yeras (Myr) into the current eon - the Phanerozoic eon. Before that was the Proterozoic eon which lasted 1959 Myr, the Archean eon (1500 Myr) and the oldest, the Hadean eon (500 Myr).


What are the first three eons that make up geologic history?

There are 4 Eons not 3, these are :Phanerozoic 540 million years ago to today.Proterozoic 2.5 billion to 540 million years agoArcheozoic 3.9 to 2.5 billion years agoHadean 4.6 to 3.9 billion years ago


What is a Time scale?

A table that divides up earths histoty into eons, eras,periods,and epochs


What is time scale?

A table that divides up earths histoty into eons, eras,periods,and epochs


How long ago was the Archean age relative to the entire history of the earth?

look the answer up somewhere else b i t c h


The longest subdivision of geologic time are called?

The longest subdivision of geologic time is called an super eon. Super eons make up a REALLY big chunk of time, around 2-4 billion years! There has only been 1 super eon the-Precambrian super eon. The hasn't been any new super eons due to the gap between Precambrian super eon & today-only a few hundred million years.


What climatic factors enabled life on Earth?

the Archean; and the Proterozoic.The Hadean period lasted approximately 800 million years, during which time Earth formed and was covered in molten lava.The Archean period started when Earth's crust hardened, giving us the first rock record, about 3.8 billion years ago. Earth's supercontinent and the first living organisms also developed during this period.The Proterozoic period included large glacial ice-sheets covering the supercontinent, and single-celled ocean-dwelling organisms are the only life so far.As oxygen built up in the atmosphere, it interacted with radiation from the sun and created ozone, about 2 billion years ago. This protective layer made life possible on land.