Iam confused on this
which of the following borders is not defined by a natural boundary?

the state border between arkansas and mississippi
the state border between texas and oklahoma
the international border between texas and mexico
the international border between montana and canada

D. the international border between Montana and Canada

polling is a process and the outcome is not involved in the process itself.

the outcome, which is an unfavorable rating for a particular candidate is not affected by the mechanical process of polling.

it rather depends on the number of people voting in favor of the candidate.

this is an outcome of people's preferences.

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.