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The humid period began about 14,600–14,500 years ago at the end of Heinrich event 1, simultaneously to the Bølling–Allerød warming. Rivers and lakes such as Lake Chad formed or expanded, glaciers grew on Mount Kilimanjaro and the Sahara retreated. Two major dry fluctuations occurred; during the Younger Dryas and the short 8.2 kiloyear event.
The first phase is created by a wobbling of the Earth's axis of rotation and is known as axial precession. While the second phase is known as apsidal precession or procession of the ellipse and is related to the slow rotation of the Earth's elliptical orbit around the Sun. When combined these two phases create a precession of the equinoxes that ...
Phase III dates from 5200 BCE to 2200 BCE and is characterized by the second main occupation of the site at Gobero by a group known as the Tenerians. [1] The final Phase, Phase IV, dates from 2500 BCE to 300 BCE and is the period in which the Sahara dries out once more, ending any occupation.
End 114 117 Rome reaches its greatest expanse in terms of territory, stretching from the Sahara desert, to England and Belgium, along the Danube River and Black Sea to Mesopotamia and modern-day Kuwait. 186 Hatepe eruption in New Zealand turns the skies red over Rome and China. [12]
Rainfall departures from normal are depicted. Blues area areas where 400 to more than 600% of typical rainfall has fallen from mid-July to early September.
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The Sahara (/ s ə ˈ h ɑːr ə /, / s ə ˈ h ær ə /) is a desert spanning across North Africa.With an area of 9,200,000 square kilometres (3,600,000 sq mi), it is the largest hot desert in the world and the third-largest desert overall, smaller only than the deserts of Antarctica and the northern Arctic.
Between 11,000 and 5,000 years ago, the Sahara was covered with vegetation and lakes, according to a 2012 paper authored by De Menocal. "It looks like a desert, and then when the rain comes, then ...