Early attempts : a variety of approaches -- Modern radiometric methods : how they work -- Earth's oldest rocks : the direct evidence -- Moon rocks : samples from a sister planet -- Meteorites : visitors from space -- Isotopes of lead : the hourglass of the solar system -- The universe and the elements : indirect evidence -- What we know and do not know
Summary
Studies the evidence that scientists believe proves that the earth is more than four billion years old
Analysis
geological time - measurement
Bibliography
Includes bibliographical references (pages 407-443) and index
