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Shell structure
it is a frame sturctures
a teepee is a frame structre
its a frame
eiffel tower is a frame structure.
mass
sheel
mass structure, frame structure and shell structure
mass
shell because it is hollow and therefore represents the form of a shell which is also recognized as a shell structure
Mass I think because foam is not a shell structure or frame.
A crayon is a mass struture. It is a mass structure because it does not have a skeleton for a frame is does not hold anything it is, so it isn't a shell so it must be a mass.