Search results
Results from the WOW.Com Content Network
Pomponius is unique among ancient geographers in that, after dividing the Earth into five zones, of which two only were habitable, he asserts the existence of antichthones, people inhabiting the southern temperate zone inaccessible to the folk of the northern temperate regions due to the unbearable heat of the intervening torrid belt.
Before Homo sapiens, Homo erectus had already spread throughout Africa and non-Arctic Eurasia by about one million years ago. The oldest known evidence for anatomically modern humans (as of 2017) are fossils found at Jebel Irhoud, Morocco, dated about 360,000 years old.
The earliest evidence for life on Earth includes: 3.8 billion-year-old biogenic hematite in a banded iron formation of the Nuvvuagittuq Greenstone Belt in Canada; [30] graphite in 3.7 billion-year-old metasedimentary rocks in western Greenland; [31] and microbial mat fossils in 3.48 billion-year-old sandstone in Western Australia.
If an earlier civilization existed on Earth millions of years ago, we might have trouble finding evidence of it -- but that doesn't mean it didn't exist.
Behavioral modernity develops by this time or earlier, according to the "great leap forward" theory. [70] Extinction of Homo floresiensis. [71] M168 mutation (carried by all non-African males). Appearance of mt-haplogroups U and K. Peopling of Europe, peopling of the North Asian Mammoth steppe. Paleolithic art.
The geological time scale (GTS), as defined by international convention, [3] depicts the large spans of time from the beginning of Earth to the present, and its divisions chronicle some definitive events of Earth history. Earth formed around 4.54 billion years ago, approximately one-third the age of the universe, by accretion from the solar nebula.
Vascular dementia, the second most common type of dementia after Alzheimer’s disease, can be caused by atherosclerosis, a buildup of plaque in the arteries that can lead to heart attacks, stroke ...
The history of life on Earth traces the processes by which living and extinct organisms evolved, from the earliest emergence of life to the present day. Earth formed about 4.5 billion years ago (abbreviated as Ga, for gigaannum) and evidence suggests that life emerged prior to 3.7 Ga. [1] [2] [3] The similarities among all known present-day species indicate that they have diverged through the ...