The location of the inca civilization of south
america demonstrates the
(1) importance of trade with western europe
(2) ability of humans to adapt the environment
(3) influence of cultural diversity
(4) complexity of indigenous belief systems

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.