"0"^^ . "rubidium-strontium dating"@en-us . "0"^^ . . . . . . "100935178"@en-us . . . "geological dating based on the proportions of radioactive rubidium into its decay product strontium; radioactive rubidium has a half-life of 47,000,000,000 years"@en-us . . "100992995"^^ . "00992995-n"^^ . . . "rubidium-strontium dating"^^ .