Nitrogen-based fertilizers break down into nitrates. when the nitrates enter the substrate, they are converted into nitrogen gas through which process? ammonification denitrification nitrification nitrogen fixation

 Denitrification

Explanation:

Denitrification is a microbial mediated process. In this the nitrate and nitrite the two forms of nitrogen are converted into gaseous forms of nitrogen like nitrous oxide and atmospheric nitrogen gas.

Based on the above explanation, the nitrogen-based fertilizers may be broken down into nitrates by the denitrification process.

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.

hope this .. .

weathering is the answer.