Barrier of death
Oceans are some of the natural barriers in the planet.
Batman
Sahara Desert, Sahel, Savanna.
skin acts as a natural barrier against harmful stuff :) So do tears, sweat and the stomach :)
A gas that is not man-made or refined.
The Natural Barriers in canada are Molten lava and cars
Oceans are some of the natural barriers in the planet.
The natural barriers and isolation allowed China to
no natural barriers are rivers, cliffs...... natural stuff not man made
Natural barriers are geographical features that provide obstacles.
Mountains and oceans are the natural barriers of western africa
Batman
unpredictable flooding of natural barriers for protection . Natural Resources limited.
security barriers
monsoons
The body has a number of natural barriers, your skin, your eyelashes, mucus and even tears are all natural barriers to name but a few.
Most of the borders of the U.S. are marked by oceans; the next most frequent natural barriers are rivers.