14 yr old dating 16 yr old

Posted by / 30-May-2020 23:44

14 yr old dating 16 yr old

All the major continents contain a core of very old rocks fringed by younger rocks.These cores, called Precambrian shields, are all that remain of the Earth’s oldest crust.These oldest rocks are metamorphic rocks with earlier but now erased histories, so the ages obtained in this way are minimum ages for the Earth.Because the Earth formed as part of the Solar System, a second approach is to date extraterrestrial objects, i.e., meteorites and samples from the Moon.The last modification to the geologic time scale of Figure 1 was in the 1930s, before radiometric dating was fully developed, when the Oligocene Epoch was inserted between the Eocene and the Miocene.Although early stratigraphers could determine the relative order of rock units and fossils, they could only estimate the lengths of time involved by observing the rates of present geologic processes and comparing the rocks produced by those processes with those preserved in the stratigraphic record.

It is, therefore, more correct to talk about formational intervals rather than discrete ages for the Solar System and the Earth.This method is thought to represent the time when lead isotopes were last homogeneously distributed throughout the Solar System and, thus, the time that the planetary bodies were segregated into discrete chemical systems.The results from these methods indicate that the Earth, meteorites, the Moon, and, by inference, the entire Solar System are 4.5 to 4.6 billion years old.Three basic approaches are used to determine the age of the Earth.The first is to search for and date the oldest rocks exposed on the surface of the Earth.

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The rocks in these shields are mostly metamorphic, meaning they have been changed from other rocks into their present form by great heat and pressure beneath the surface; most have been through more than one metamorphism and have had very complex histories.

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