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Despite seeming like a relatively stable place, the Earth's surface has changed dramatically over the past 4.6 billion years.

Mountains have been built and eroded, continents and oceans have moved great distances, and the Earth has fluctuated from being extremely cold and almost completely covered with ice to being very warm and ice-free.

As these changes have occurred, organisms have evolved, and remnants of some have been preserved as fossils.

Strata Thickness- In the late 1800s, a British geologist estimated that 75 million years has lapsed since the beginning of the Cambrian.

This estimate was based upon the maximum known thickness of strata (from Cambrian to present) divided by the average rate of sedimentation in modern environments. Joly used the salinity of ocean water to determine the age of the earth.

) is only 5,730 years—that is, every 5,730 years, half of it decays away.

After two half lives, a quarter is left; after three half lives, only an eighth; after 10 half lives, less than a thousandth is left.




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