What was probably one of peary's most important specifications for building the roosevelt

The Roosevelt was very sturdy and it was able to break through ice.

a big wall across the mexican border so no drugs, terrorist, or illegal immigrants can come through : )    

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.