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The natural history of Earth concerns the development of planet Earth from its formation to the present day. [ 1 ] [ 2 ] Nearly all branches of natural science have contributed to understanding of the main events of Earth's past, characterized by constant geological change and biological evolution .
The ice age was probably not as long-lasting as once thought; study of oxygen isotopes in fossil brachiopods shows that it was probably no longer than 0.5 to 1.5 million years. [41] The event was preceded by a fall in atmospheric carbon dioxide (from 7000ppm to 4400ppm) which selectively affected the shallow seas where most organisms lived.
12.5.1.1 Russian Federation. 12.5.2 Western Europe. 12.6 Oceania. ... History of the World Wide Web; History of computing. History of computing hardware
c. 5.96–5.33 Ma – Messinian Salinity Crisis: the precursor of the current Strait of Gibraltar closes repeatedly, leading to a partial desiccation and strong increase in salinity of the Mediterranean Sea. c. 5.4–6.3 Ma – Estimated age of the Homo/Pan (human vs. chimpanzee) split. c. 5.5 Ma – Appearance of the genus Ardipithecus
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[10] [11] The answer depends on the definition of "people", i.e., whether only Homo sapiens are to be counted, or all of the genus Homo; due to the small population sizes in the Lower Paleolithic, however, the order of magnitude of the estimate is not affected by the choice of cut-off date substantially more than by the uncertainty of estimates ...
The inhabited part of his world was circular, disk-shaped, and presumably located on the upper surface of the cylinder. [17]: 24 For constructing his world map, Anaximander is considered by many to be the first mapmaker. [22]: 23 Little is known about the map, which has not survived.
Key Stage 3 6th grade 12–13 Year 8 Second form 7th grade 13–14 Year 9 Third form 8th grade High school Senior high school; 14–15 Year 10 Fourth form Key Stage 4, GCSE: 9th grade Freshman year 15–16 Year 11 Fifth form 10th grade Sophomore year Sixth form / FE College [26] 16–17 Year 12 Lower sixth (AS) Key Stage 5, A level: 11th grade ...
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