20,000 years ago was during the Late Stone Age, or Upper Paleolithic period. Humans were hunter-gatherers, relying on hunting wild animals, fishing, and gathering wild plants for food. They lived in small nomadic groups, creating tools from stone, bone, and wood, and creating cave art for expression and communication.
Life is estimated to have first begun on Earth around 3.5 to 4 billion years ago. This early life was likely in the form of single-celled organisms in the Earth's oceans.
There is evidence to suggest that life on Earth first appeared around 3.8 billion years ago. However, there likely were periods of time when life faced significant challenges, such as during mass extinction events like the Permian-Triassic extinction around 252 million years ago.
Life first flourished on Earth during the Precambrian era, which lasted from about 4.6 billion years ago to around 541 million years ago. This period saw the emergence of the first single-celled organisms like bacteria and algae, laying the foundation for the diversity of life that we see today.
The most recent glacial advance is known as the Last Glacial Maximum, which peaked around 20,000 years ago during the Pleistocene epoch. This period was marked by extensive ice sheet coverage and lower global temperatures.
It is believed that the Earth was still in a molten state 4.6 billion years ago, so there were no plants or any other complex life forms on the planet at that time. The first evidence of simple life forms appeared around 3.5 billion years ago.
.02 million years ago 2.0x10-8
20000 years ago
why as it so cold in the UK 200000 years ago
20000 years ago
Yes.
Year 17990 BC.
The first "Americans" were able to migrate to the Western Hemisphere 20,000 or more years ago because North America was then connected by land to ASIA.
Borining
300 years ago - roughly the same time as the industrial revolution escalated.
liv from 70 years agoe
One possibility would be V838 Monocerotis which exploded about 20,000 years ago.
hi