Radiometric dating age of earth odnoklassniki ru appdating
Note that at time 0, the time of the mineral's formation, the crystal contains only parent atoms.
At time 1, 50% of the parent atoms remain; at time 2, only 25% remain, and so on.
Scientists determined the Earth's age using a technique called radiometric dating.
Radiometric dating is based upon the fact that some forms of chemical elements are radioactive, which was discovered in 1896 by Henri Becquerel and his assistants, Marie and Pierre Curie.
The oldest rocks and soils from the moon are about the same age--4.6 billion years old.
Scientists assume that meteorites and moon rocks were not subjected to the extensive alteration that Earth rocks have undergone.
This means that as radioactive parent elements decay, they and their daughters are trapped together inside the crystal.
Therefore, their ages indicate when they were formed.
Because all parts of the solar system are thought to have formed at the same time (based on the solar nebula theory), the Earth must be the same age as the moon and meteorites--that is, about 4.6 billion years old.
One line of evidence involves rocks from outside the Earth--meteorites and moon rocks.
Radiometric dating shows that almost all meteorites are between 4.5 and 4.7 billion years old.