Provide an example of a place where a physical border has been beneficial.

Provide an example of a place where a physical border has created challenges.

Provide an example of a place where a cultural border has been beneficial.

Provide an example of a place where a cultural border has created challenges.

South and north korean border zone

Mexican mountain ranges decentralize the mexican government and give power to the cartel

Hong kong

ukraine and russia

Explanation:

a mid-ocean ridge or mid-oceanic ridge is an underwater mountain range, formed by plate tectonics. this uplifting of the ocean floor occurs when convection currents rise in the mantle beneath the oceanic crust and create magma where two tectonic plates meet at a divergent boundary.a geomagnetic reversal is a change in a planet's magnetic field such that the positions of magnetic north and magnetic south are interchanged.