If there are 1.2 billion atoms of Potassium-40 and 8.4 billion atoms of Argon-40 in what is considered to be the oldest sedimentary rock on Earth, how old is the rock? Consult the table below: Radioactive Parent Isotope Stable Daughter Half Life Uranium-238 Lead-206 4.5 Billion Years Uranium-235 Lead-207 713 Million years Thorium-232 Lead-208 14.1 Billion Years Rubidium-87 Strontium-87 47.0 Billion Years Potassium-40 Argon-40 1.3 Billion Years O 4.5 billion years old O 6.7 million years old O 3.9 billion years old 0 15 Lillion years old O213 miltion years old

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