Uranium lead dating process

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The study of geology grew out of field studies associated with mining and engineering during the sixteenth to nineteenth centuries.

In these early studies the order of sedimentary rocks and structures were used to date geologic time periods and events in a relative way.

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Finally in 1976, it was discovered that the earth is “really” 4.6 billion years old… What happened?In 1898, Marie Curie discovered the phenomenon of radioactivity, in which unstable atoms lose energy, or decay, by emitting radiation in the form of particles or electromagnetic waves.By 1904 physicist Ernest Rutherford showed how this decay process could act as a clock for dating old rocks.It was based on the idea that no significant source of novel heat energy was affecting the Earth.He believed this even though he did admit that some heat might be generated by the tidal forces or by chemical action.

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