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→Increasing ages: Remove bias that the date is correct; reword for the context; shorten the reference.
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 Potassium-Argon (K:Ar) dating technique has demonstrated that the oldest rocks on Earth are about 4,400 millions years, which supports the view of the Earth being formed long ago.<ref>Peck WH, Valley JW, Wilde SA, and Graham CM (2000) Ion microprobe Evidence for Pre-4.4 Ga Continental Crust and Low Temperature Water/Rock Interaction. Geol. Soc. Am. Abstr, vol 32, no. 7, p. 376.</ref>
The currently-proposed age is 4,500 million years, based in part on rocks dated by [[Potassium-Argon]] (K:Ar) dating at about 4,400 millions years.<ref>Peck, 2000, p.376.</ref>
== Bibliography ==
== Bibliography ==