Class C airspace resembles which shape?

Class C airspace is designed to manage air traffic around busy airports and is structured in a way that resembles an upside-down two-layer wedding cake. This geometric shape effectively accommodates aircraft departing from and arriving at the airport, allowing for controlled operations both vertically and horizontally.

The lower layer, which is closer to the airport, extends from the surface up to a specified altitude, while the upper layer extends from the top of the lower layer to a higher altitude, tapering off as it moves outwards. This design helps create a controlled environment where air traffic can be safely managed, providing separation between arriving and departing aircraft as well as between different levels of air traffic within the vicinity of the airport.

This structure differs from other airspace classification shapes, such as a donut, cylinder, or an upside-down pyramid, which do not accurately depict the operational needs and air traffic control requirements specific to Class C airspace. Thus, the description of an upside-down two-layer wedding cake is the most accurate representation of how Class C airspace is organized.