Why was the Union interested in Chattanooga and Atlanta? They were railroad hubs and central to supply lines.
Strong resistance had prevented their take over.
They were key ports for trade.
Thousands of troops were stationed there.

Option: They were railroad hubs and central to supply lines.

Explanation:

During the Civil War, the Union needed to keep hold of Chattanooga and Atlanta because these places were part of the railroad junction which remains as vital for supplying goods to the troops.

Atlanta became a target because of its unusual economic and political importance to the Confederacy. It was a significant railroad hub for the support for the war effort.

c. taught scientists many new things about the earth, but not other planets.

explanation: