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Another line of evidence is based on the present-day abundances of the various isotopes of lead found in the Earth's crust. Three of these isotopes (lead 206, 207, 208) result from radioactive decay of isotopes of thorium and uranium.

But if the hourglass were to break (become an open system), sand leaks out and the hourglass is no longer a reliable tool for telling time.This means that all of the lead 204 on the Earth has been around since the formation of the Earth.Based on extensive sampling of the Earth's crust, scientists determined the present-day abundances of the four isotopes of lead relative to each other and to the parent isotopes that produced three of them.We know the Earth must be at least as old as any rock on it.Unfortunately, none of the original rocks still exist, so scientists had to use less direct evidence to determine the age of the Earth.




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It's open weekdays 9 to 5 and Saturday 9 to 2; things here are most active when cruise ships are in port. Bequia is a Carib word meaning "island of the cloud." Hilly and green with several golden-sand beaches, Bequia is 9 miles (14½ km) south of St.


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