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We can get absolute ages only if we have rocks from that surface.

For others, all we are doing is getting a relative age, using things like the formation of craters and other features on a surface.

These are the surfaces that we can get absolute ages for.

For the others, one can only use relative age dating (such as counting craters) in order to estimate the age of the surface and the history of the surface.

those that form during chemical reactions without breaking down).

The unstable or more commonly known radioactive isotopes break down by radioactive decay into other isotopes.

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Index fossils are fossils that are known to only occur within a very specific age range.

We have rocks from the Moon (brought back), meteorites, and rocks that we know came from Mars.

We can then use radioactive age dating in order to date the ages of the surfaces (when the rocks first formed, i.e. We also have meteorites from asteroids and can date them, too.

Radioactive dating is a method of dating rocks and minerals using radioactive isotopes.

This method is useful for igneous and metamorphic rocks, which cannot be dated by the stratigraphic correlation method used for sedimentary rocks. Some do not change with time and form stable isotopes (i.e.

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