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Oceans and deep rivers form natural boundaries because they restrict human and animal migration.
Oceans and deep rivers form natural boundaries because they restrict human and animal migration.
They prevented by directions and distance
Mountains and oceans are the natural barriers of western africa
Oceans are some of the natural barriers in the planet.
Oceans and deep rivers form natural boundaries because they restrict human and animal migration.
D. looks at oceans as highways instead of barriers
The oceans formed pretty big barriers.
the oceans
Most of the borders of the U.S. are marked by oceans; the next most frequent natural barriers are rivers.
Isolation can be due to behavioral, geographical, or temporal barriers.
Water cycle is the term for the constant movement of the earth's water from oceans to air to land and back to oceans