frame
mass
it is a frame sturctures
its a frame
A pop can is considered a shell because it is a hollow structure with a thin exterior wall. It does not have a solid mass throughout, like a solid frame.
mass
mass
eiffel tower is a frame structure.
FRAME STRUCTURESFrame structures are structures that are made up of rigid (stiff, firm, difficult to bend) parts joined together to form something called a framework. These parts are known as members. There are lots of examples of frame structures such as a bridge - a bridge is a frame structure that spans a gap, and a bicycle is a frame structure that supports a load such as the mass of a person.SHELL STRUCTURESShell structures contain or protect things from the outside and are usually hollow inside. In a shell structure, the outside layer of the structure holds the whole object together. Examples of shell structures are the mug that holds your coffee, the snail shell which both protects and contains the snail, honeycomb which contains and protects bee's honey and shells of nuts.
shell because it is hollow and therefore represents the form of a shell which is also recognized as a shell structure
the Eiffel tower is a definite frame. if the tower had something over the frame it would be a mass so the Eiffel tower would never be a shell if it had the framing still inside of it.
mass structure, frame structure and shell structure