What separates the gulf of mexico and pacific ocean

The land mass that deprecated the two is mostly Mexico. But in regards to water-ways, the Gulf of Mexico and Pacific Ocean are separated by the Panama Canal. I hope this helps

Cause of he different elevations  hope this ?

Master planned communities outside of chicago. note: population density means people living in an area per square mile. chicago, an urban and highly populated area has a much more higher density than a desert, amish community, settlement, or nomadic region.