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Name three methods to data rocks
Radioactive dating
Law of superposition
Palaeomagnestism
Describe how radioactive dating works?
Radioactive dating via the decay of radioactive isotopes
This provide absolute ages e.g years
Living things take C from the atmosphere hence have the 14^C / 12^C ratio
When they die 14^C decays into 14N,but the amount of 12^C stays the same
We know the rate of 14C decay(half life)so we can work out how long ago an organism died
Describe laws of superposition
In under formed stratigraphic sequences in sedimentary ,the oldest stata (rock later) will be at the bottom of the sequence and the youngest at top
Provides relative age,not absolute age
The fossils presented in the rock can be used to estimate a specific time period
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