about 4600 million years ago
It varied a lot but it became very cold and the Earth became covered with ice.
in the precambrain time
Paleozoic
During the Precambrian Era, life forms were predominantly single-celled organisms such as bacteria and algae. These organisms were simple and lacked the complex structures seen in later eras. It was a time of significant evolution and diversification of life on Earth.
Precambarian- When earth’s atmosphere formed Mesozoic- Ended with a massive impact Paleozoic- When oxygen-breathing organisms first thrived Cenozoic- Began about 65 million years ago Hope this helps! :)
The Medieal era started with the Norman Conquest in 1066
The Victorian Era started at 1819 to 1901
1924
about 9500bc
During the Precambrian period, Earth's atmosphere and oceans were forming, and the first simple life forms like single-celled organisms appeared. There were no major events like the complex life forms and multicellular organisms evolved later during the Paleozoic era.
11003 bc
around 1654