Talk:KREEP
Add topicLatest comment: 15 years ago by عباد ديرانية in topic obscure symbols
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obscure symbols
[edit]Please, explain for me "Canonical composition of KREEP includes 1% (wt) of potasium and phosphorus oxides, 20-25 ppm of Rb". what do "ppm" and "Rb" refers to in this sentence? --aad_Dira (talk) 10:48, 1 February 2011 (UTC).