Which of the following has the smallest porosity, making it virtually impermeable? sand
clay
gravel
silt

Cultural convergence is the theory that two cultures will be more and more like each other a very notable example of this is around the u.s.-mexico border, where 

Answergoogle earth; i believe this is the correct answer, plz check first;

Ineed you to put up a picture of the map so i can you as much as possible.

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