What parallel line divided north vietnam and south vietnam?

The Vietnamese Demilitarized Zone was a demilitarized zone established as a dividing line between North and South Vietnam as a result of the First Indochina War. During the Vietnam War, it became important as the battleground demarcation separating North from South Vietnamese territories.

the causes of the dust bowls were severe droughts,   lands became dry and hard, temperature was higher than usual, hot and dry conditions killed crops, high winds. because of those factors, the winds kicked up dry soil and created clouds of dust.

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