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As the dating technology progressed, these methods proved unreliable; for instance, the rise and fall of the ocean was shown to be an ever-changing process rather than a gradually declining one.And in another effort to calculate the age of the planet, scientists turned to the rocks that cover its surface.Taken as a whole, these data indicate that the Earth’s history extends backward from the present to at least 3.8 billion years into the past.For example, scientists search for and date the oldest rocks exposed on Earth’s surface.Using this technique, scientists could, for example, analyze a sample from Earth’s crust, figure out the quantities of uranium and lead, plug those values along with the half-life into a logarithmic equation, in order to compute the age of the rock.Over the decades of the 20th century, scientists documented tens of thousands of radiometric age measurements.
Greenland boasts the Isua supracrustal rocks (3.7 to 3.8 billion years old), while rocks in Swaziland are 3.4 billion to 3.5 billion years.
Scientists have made several attempts to date the planet over the past 400 years.
They've 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.
Many great thinkers throughout history have tried to figure out Earth’s age.
For example, back in 1862, Lord Kelvin calculated how long Earth might have taken to cool from its original molten state.
Likewise, scientists use radiometric dating to determine the ages of moon rocks, obtained by astronauts.