Why did livy believe that the tiber river and mediterranean sea were beneficial to rome

Livy believed that the Tiber river and Mediterranean sea were beneficial to Rome because

A the river was very important means of transportation. It was used to cargo  produce from the inland regions.

The sea too was important for commerce making shipments from abroad possible without the danger of enabling the influx of battle fleets from their enemies.

Cheers!

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.

the answers are a b and d