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change "millions years" to "million years"
By about 1930, J. H. Jeans was arguing for an age of the Earth of around 2,000 million years.<ref>Universal History of the World, p.76.</ref>
By about 1930, J. H. Jeans was arguing for an age of the Earth of around 2,000 million years.<ref>Universal History of the World, p.76.</ref>
The currently-proposed age is 4,500 million years, based in part on rocks dated by [[Potassium-argon dating|Potassium-argon (K:Ar) dating]] at about 4,400 millions years.<ref>Peck, 2000, p.376.</ref>
The currently-proposed age is 4,500 million years, based in part on rocks dated by [[Potassium-argon dating|Potassium-argon (K:Ar) dating]] at about 4,400 million years.<ref>Peck, 2000, p.376.</ref>
== Bibliography ==
== Bibliography ==