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Earth formed around 4.54 billion years ago, approximately one-third the age of the universe, by accretion from the solar nebula. [4] [5] [6] Volcanic outgassing probably created the primordial atmosphere and then the ocean, but the early atmosphere contained almost no oxygen.
In 1862, the physicist William Thomson, 1st Baron Kelvin published calculations that fixed the age of Earth at between 20 million and 400 million years. [19] [20] He assumed that Earth had formed as a completely molten object, and determined the amount of time it would take for the near-surface temperature gradient to decrease to its present value.
t. e. This timeline of prehistory covers the time from the appearance of Homo sapiens approximately 315,000 years ago in Africa to the invention of writing, over 5,000 years ago, with the earliest records going back to 3,200 BC. Prehistory covers the time from the Paleolithic (Old Stone Age) to the beginning of ancient history .
Aug. 28—As Martin Luther King Jr. addressed perhaps 250,000 people spread out before the steps of the Lincoln Monument 60 years ago today, he began with that most American of topics: money. A ...
The last time the sea level was higher than today was during the Eemian, about 130,000 years ago. [2] Over a shorter timescale, the low level reached during the LGM rebounded in the early Holocene, between about 14,000 and 6,500 years ago, leading to a 110 m sea level rise. Sea levels have been comparatively stable over the past 6,500 years ...
On April 12th, 1961, Yuri Gagarin made history by becoming the first person to ever enter outer space. In the past 60 years we've seen massive advancements in manned space exploration, and it all ...
The march is credited with shifting the tide for social rights in the United States, paving the way for the Civil Rights Act signed into law 60 years ago today. Then, many Black Americans, who ...
The geologic temperature recordare changes in Earth's environmentas determined from geologicevidence on multi-million to billion (109) year time scales. The study of past temperatures provides an important paleoenvironmental insight because it is a component of the climate and oceanographyof the time. Methods.