The city of urbania was designed by city planners to address the needs of both the city's businesses and its citizens. single-family housing will be limited. most people will live in multi-unit housing, such as apartments or condominiums. businesses must limit the height of buildings to ten stories. common areas must be created within each square mile of the city. the planners have determined urbania's

a mid-ocean ridge or mid-oceanic ridge is an underwater mountain range, formed by plate tectonics. this uplifting of the ocean floor occurs when convection currents rise in the mantle beneath the oceanic crust and create magma where two tectonic plates meet at a divergent boundary.a geomagnetic reversal is a change in a planet's magnetic field such that the positions of magnetic north and magnetic south are interchanged.