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Why are the last 570 million years of Earths history divided into 3 different eras while the preceding 4 billion years compromise only one era?
Precambrian: Nothing exciting happened, just orogenic processes that basically created the planet we'd recognize today.
As opposed to...
Paleozoic with the first non-cellular life forms really taking off
Mesozoic: all the really cool stuff, like dinosaurs
Cenozoic: the planet re-cooperating from a massive meteor strike, eventually the rise of mammals & humans
What else can I help you with?
What length of time does the geological time scale cover?
Since the paleozoic the Cretaceous and Carboniferous periods were the longest, each about 80 million years. The Neogene (Cenozoic period preceding the current Quaternary period) was only 22 million years. Periods are marked by significant climate or environmental change, including mass extinctions and the proliferation of new species. Everything before the Vendian is lumped into the Proterozoic period, extending back about 1.9 billion years. Geologists may divide that up further as they determine periods of significant change recorded in ancient rock.
What time span is encompassed by Precambrian time?
Precambrian time spans from about 4.6 billion years ago to around 541 million years ago. It represents roughly 90% of Earth's history and is divided into three eons: Hadean, Archean, and Proterozoic.
What was the longest era?
The longest era in geologic time is the Precambrian era, which lasted from about 4.6 billion years ago to 541 million years ago. It encompasses about 90% of Earth's history and is divided into several eons, including the Hadean, Archean, and Proterozoic.
What are the 2 different kinds of leaves?
the 2 main types of leaves is needles and broad needles
What can the Geological eras be divided into?
The Geological eras can be divided into three major eras: Paleozoic, Mesozoic, and Cenozoic. These eras represent different periods in the Earth's history marked by significant geological and biological changes. Each era is further subdivided into periods, epochs, and ages.
What is a billion billion divided by 6 billion?
5
What is 10 billion divided by 3500?
0.0029
What is 7 billion divided by 18?
0.3889
What is 317032206 divided by 40 billion?
7925805.15
What is 5.7 billion divided by 28?
0.2036
What is 1.2 billion dollars divided by 4?
0.3
What is 819 billion divided by 75000000?
0
1 billion divided by 4500?
0.0002
What is 1 billion divided by 45 equal?
0.0222
What is 1.3 billion divided by 31000?
0
What is 1 billion divided into 8000 people?
1 billion divided into 8000 people = 0.000125
What is 1.5 billion divided by 10 percent?
1.5 billion divided by 10 percent = 0.15
