What's different about the 4 dams

Explanation:

Kariba Dam, Zimbabwe. Kariba Dam is the world's biggest dam based on water storage capacity. ...

Bratsk Dam, Russia. ...

Akosombo Dam, Ghana. ...

Daniel Johnson Dam, Canada. ...

Guri Dam, Venezuela. ...

Dam is created as a barrier that stops or restricts the flow of water or underground streams. Whereas, Reservoir is an open-air storage area (usually formed by masonry or earthwork) where water is collected and kept in quantity so that it may be drawn off for use.

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 .. .