What caused the main ecological problem in Costa Rica between 1963 and 1983? When did Costa Rica establish a system of nature reserves and national parks?
What is Costa Rica strategy to correct the problem?

happy berdey to you happy berdey to you happy berdey happy berdey happy berdey to you

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 .. .

climate change and pollution