What is the major difference between the saturated and unsaturated zones

What is the difference between the saturated and the unsaturated zones of ground water?

The pore spaces in the saturated zone are completely full of water; the pore spaces in the unsaturated zone are not completely full of water. The boundary between the saturated zone and the unsaturated zone is called the water table.

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relative dating involves things like higher layers are most recent than rocks lower in the sequence. this can be extended to the known sequence of fossils. rocks containing rabbit fossils are later than those containing dinosaur fossils.  

absolute dating methods mainly use radioactive elements that have known rates of decay and produce recognizable products. for example potassium 40 decays to produce argon. once a rock has solidified the argon is trapped. by measuring the argon and potassium0 you can get an accurate number for the age.  

some other methods are good for archaeological ages. dendrochronology involves recognizing the sequence of tree rings. the orientation of magnetized particles in baked clay can be used to date a fire.

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