Sondli xxx

But, again, exptrapolation of the discordia back to the two points where it intersects the Concordia, would give two ages - t* representing the possible metamorphic event and t and solve for t .

This argument tells when the elements were formed that make up the Earth, but does not really give us the age of the Earth.

The rate of decay or rate of change of the number N of particles is proportional to the number present at any time, i.e.

The half-life is the amount of time it takes for one half of the initial amount of the parent, radioactive isotope, to decay to the daughter isotope.

Thus, our best estimate of the age of the Earth is 4.55 billion years.

The energies involved are so large, and the nucleus is so small that physical conditions in the Earth (i.e.

Nd ratios on several minerals with a mass spectrometer and then from the slope determine the age of the rock.

Over time, radioactive isotopes change into stable isotopes by a process known as radioactive decay.

The initial ratio has particular importance for studying the chemical evolution of the Earth's mantle and crust, as we discussed in the section on igneous rocks.

If this happens, then the date obtained will be older than the date at which the magma erupted.

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