Editing 10th millennium BC (section)

==Environmental changes==
{{Quaternary (period)}}
In the southern hemisphere, rising sea levels had gradually formed [[Bass Strait]], separating [[Tasmania]] from mainland [[Australia]]. This process is believed to have been complete by about the beginning of the 10th millennium. Bass Strait had been a plain populated by indigenous people who are thought to have first arrived around 40,000 years ago.<ref>{{cite web |url=https://www.nma.gov.au/defining-moments/resources/separation-of-tasmania |title=Separation of Tasmania |publisher=National Museum Australia |location=Canberra |access-date=22 July 2020 |archive-date=19 August 2020 |archive-url=https://web.archive.org/web/20200819040459/https://www.nma.gov.au/defining-moments/resources/separation-of-tasmania |url-status=live }}</ref>

The [[Wisconsin glaciation]] had sheeted much of North America and, as it retreated, its meltwaters created an immense proglacial lake now known as [[Lake Agassiz]].{{sfn|Ojakangas|Matsch|1982|pp=106–110}} Sometime after 10,000 BC, the retreating [[glacier]]s created the rock formation on [[Cannon Mountain (New Hampshire)|Cannon Mountain]] in present-day [[New Hampshire]] that was known as the [[Old Man of the Mountain]] until its collapse in 2003.<ref name=Linowes>{{cite web |url=http://www.oldmanofthemountainlegacyfund.org/about/geology.aspx |title=Old Man of the Mountain Legacy Fund: Geology of the Old Man of the Mountain |last=Linowes |first=Jonathan |website=www.oldmanofthemountainlegacyfund.org |access-date=27 May 2019 |archive-date=27 May 2019 |archive-url=https://web.archive.org/web/20190527125041/http://www.oldmanofthemountainlegacyfund.org/about/geology.aspx |url-status=live }}</ref>