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Unformatted text preview: 71 million years = Igneous Rock X 60,000 + 420,000 = 480,000 60,000/480,000 = .125 or 1/8 142 million x 3 = Igneous Rock Y 426 million years = Igneous Rock Y b. Igneous Rock X Mesozoic Era Igneous Rock Y Paleozoic Era 3. Geologic Period Mnemonic Q uestions T urn C ats J ewelry T o P urple C urly D almatians S inging O n C ord...
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- Fall '09