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XxLostAndBrokenxX

Answer: there are three different methods of determining the age of a landform.

1 radiation measurement

2 stratigraphic superposition

3 the fossil record

by using these or a combination of these they determined that the earth is around 4.6 billion years old. and this is where the big bang theory comes into play.

kevinboyle
To determine the relative age of different rocks, geologists start with the assumption that unless something has happened, in a sequence of sedimentary rock layers, the newer rock layers will be on top of older ones. This is called the Rule of Superposition. ... With absolute age dating, you get a real age in actual years

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