"Absolute" ages of geological events can often be determined the decay of certain radioactive elements in minerals that  form in igneous rock. The decay of radioactive parent atoms into stable daughter atoms (e.g., Uranium 235 to Lead-207)  occurs at a constant rate, such that each element has a specific half-life. The half- life of U-235, for example, is about 0.7  billion years

"Absolute" ages of geological events can often be determined by the decay of certain radioactive elements in minerals that form in igneous rock. The decay of radioactive parent atoms into stable daughter atoms (e.g., Uranium 235 to Lead-207) occurs at a constant rate, such that each element has a specific half-life. The half-life of U-235, for example, is about 0.7 billion years Consider the following statements A. In each 0.7 billion year period half the U-235 atoms present at the beginning of the period will decay into Pb-207 B. The ratio of parent to daughter atoms (Uranium 235 to Pb- 207) in a rock sample provides an estimate of the rock's age C. Only igneous rocks can be dated radio=metrically, so a fossil-bearing sedimentary rock must be dated by bracketing it between younger and older igneous formations D. Igneous rocks have the majority of fossils in petrified forms Which of the following statements are correct?

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