yes it is
solid
The static load on a hydro tower refers to the weight of the structure itself, including the tower, crossarms, insulators, and conductors, when it is at rest. This load is carefully calculated during the design phase to ensure that the tower can support its own weight along with any additional loads it may experience during its lifetime.
a building (that's funny)
iron
The Three Gorges Dams were made of concrete.
The Eiffel Tower is a frame structure
The structure of the tower is limestone or aliminium
If you are referring to the structure type of tower, they were/are often made of stone. If you are referring to the computer tower, they are either made of a metal such as aluminium or plastic.
The CN Tower in Toronto Canada is a concrete observation structure mainly used for TV and radio broadcasting. It also contains a number of cell sites.
A campanile is a type of freestanding bell tower, often associated with churches, that is separate from the main building. It typically houses bells and can vary in height and design.
Big Ben is a nickname for theGreat Bell in the tower clock at Westminster. The tower itself is often referred to as Big Ben
eiffel tower is a frame structure.