5. Some cities, such as Chicago and Milwaukee, have CBDs located next to lakes or oceans and so cannot expand in several directions. Other cities, such as Calgary and Atlanta, have no such natural boundaries and can expand in all directions. If you were to compare density and land price gradients in cities that have natural boundaries close to the CBD with those in cities that do not have such natural boundaries, what would you expect to find? Why? Apply your answer to the UGB question.