Editing 6th millennium BC (section)

==Environmental changes==
The [[early Holocene sea level rise]] (EHSLR), which began c. 10,000&nbsp;BC, tailed off during the 6th millennium BC. Global water levels had risen by about 60 metres due to deglaciation of ice masses since the end of the Last Ice Age.<ref>{{cite journal |title=The early Holocene sea level rise |journal=[[Quaternary Science Reviews]] |publisher=[[Elsevier]] |last1=Smith |first1=D. E. |last2=Harrison |first2=S. |last3=Firth |first3=C. R. |last4=Jordan |first4=J. T. |volume=30 |issue=15–16 |date=July 2011 |pages=1846–1860 |doi=10.1016/j.quascirev.2011.04.019 |bibcode=2011QSRv...30.1846S}}</ref> Accelerated rises in sea level rise, called meltwater pulses, occurred three times during the EHSLR. The last one, Meltwater Pulse 1C, which peaked c. 6000&nbsp;BC, produced a rise of 6.5 metres in only 140 years. It is believed that the cause was a major ice sheet collapse in Antarctica.<ref>{{cite encyclopedia |last=Blanchon |first=P. |year=2011 |title=Meltwater Pulses |editor-last=Hopley |editor-first=D. |encyclopedia=Encyclopedia of Modern Coral Reefs: Structure, form and process. |publisher=Springer |series=Earth Science Series |pages=683–690 |isbn=978-90-481-2638-5}}</ref>

Approximately 8,000 years ago (c. 6000&nbsp;BC), a massive [[volcanic landslide]] off [[Mount Etna]], [[Sicily]], caused a [[megatsunami]] that devastated the eastern [[Mediterranean Sea|Mediterranean]] coastline on the continents of Asia, Africa and Europe.<ref>{{cite journal |doi=10.1029/2006GL027790 |last1=Pareschi |first1=M. T. |last2=Boschi |first2=E. |last3=Favalli |first3=M. |year=2006 |title=Lost tsunami |journal=Geophysical Research Letters |volume=33 |issue=22 |pages=L22608 |bibcode=2006GeoRL..3322608P|doi-access=free }}</ref>

In South America, a large eruption occurred at [[Cueros de Purulla]] c. 5870&nbsp;BC, forming a buoyant cloud and depositing the Cerro Paranilla Ash in the [[Calchaquí Valleys]].<ref>{{cite journal |last1=Fernandez-Turiel |first1=J. L. |last2=Perez-Torrado |first2=F. J. |last3=Rodriguez-Gonzalez |first3=A. |last4=Saavedra |first4=J. |last5=Carracedo |first5=J. C. |last6=Rejas |first6=M. |last7=Lobo |first7=A. |last8=Osterrieth |first8=M. |last9=Carrizo |first9=J. I. |last10=Esteban |first10=G. |last11=Gallardo |first11=J. |last12=Ratto |first12=N. |title=La gran erupción de hace 4.2 ka cal en Cerro Blanco, Zona Volcánica Central, Andes: nuevos datos sobre los depósitos eruptivos holocenos en la Puna sur y regiones adyacentes |journal=Estudios Geológicos |date=8 May 2019 |volume=75 |issue=1 |doi=10.3989/egeol.43438.515 |language=es |issn=1988-3250|page=21|doi-access=free |hdl=10553/69940 |hdl-access=free }}</ref> A cataclysmic [[Types of volcanic eruptions|volcanic eruption]] occurred c. 5700 BC in [[Oregon]] when {{convert|12000|ft|m|sing=on}} high [[Mount Mazama]] created [[Crater Lake]] as the resulting caldera filled with water.<ref>{{cite web |url=https://volcanoes.usgs.gov/volcanoes/crater_lake/geo_hist_mazama.html |title=Geology and History Summary for Mount Mazama and Crater Lake |publisher=[[United States Geological Survey]] |work=Volcano Hazards Program |date=3 November 2017 |access-date=1 June 2019}}</ref> Another major eruption occurred c. 5550&nbsp;BC on [[Mount Takahe]], [[Antarctica]], possibly creating an [[ozone hole]] in the region.<ref name="GVP">{{Cite GVP|vn=390027|name=Takahe}}</ref>

The [[carbon-14]] content in [[Dendrochronology|tree rings]] created c. 5480&nbsp;BC indicates an abnormal level of [[Solar phenomena|solar activity]].<ref>{{cite journal |title=Large 14C excursion in 5480 BC indicates an abnormal sun in the mid-Holocene |last1=Miyake |first1=Fusa |author-link1=Fusa Miyake |first2=A. J. Timothy |last2=Jull |first3=Irina P. |last3=Panyushkina |first4=Lukas |last4=Wacker |first5=Matthew |last5=Salzer |first6=Christopher H. |last6=Baisan |first7=Todd |last7=Lange |first8=Richard |last8=Cruz |first9=Kimiaki |last9=Masuda |first10=Toshio |last10=Nakamura |display-authors=6 |journal=Proceedings of the National Academy of Sciences USA |volume=114 |issue=5 |pages=881–884 |publisher=National Academy of Sciences |date=31 January 2017 |doi=10.1073/pnas.1613144114 |pmid=28100493 |pmc=5293056 |bibcode=2017PNAS..114..881M |doi-access=free }}</ref>