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Radiometric dating has determined that earth is approximately

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How do they know the age of shells and other particles found in the earths crust?The secret mysteries of the earth were unlocked by the discovery of fossils, radioactive material dating of rocks and the discovery that the earth does move.As science progressed, these methods were proven to be unreliable; for instance, the rise and fall of the ocean was shown to be an ever-changing process rather than a gradually declining one.In an effort to calculate the age of the planet, scientists turned to the rocks that cover its surface.The discovery gave scientists a tool for dating rocks that contain radioactive elements.

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Some radioactive parent isotopes decay almost instantaneously into their stable daughter isotopes; others take billions of years.

Some evidence is also presented to show that radiometric results that are in agreement with the accepted geological time scale are selectively published in preference to those results that are not in agreement.

The geological time scale and an age for the Earth of 4.5 b.y.

Earlier research had shown that isotopes of some radioactive elements decay into other elements at rates that can be easily predicted.

By examining the existing elements, scientists can calculate the initial quantity, and thus how long it took for the elements to decay, allowing them to determine the age of the rock.

(1) The lore of fossils is attributed to its link to dinosaurs.

However, fossils are much older than the age of the dinosaurs.

Several attempts to scientifically date the planet have occurred over the past 400 years.

Scientists attempted to predict the age based on changing sea levels, the time it took for Earth or the sun to cool to present temperatures, and the salinity of the ocean.

magazine has been continuously published since 1978, we are publishing some of the articles from the archives for historical interest, such as this.

For teaching and sharing purposes, readers are advised to supplement these historic articles with more up-to-date ones suggested in the Related Articles and Further Reading below.