man-made structures were made by humans, but natural structures made itself.
Man made solid structures are structures that humans have built. Examples of man made solid structures are dams, brick walls and concrete and cement blocks.
A structure made by a man
Natural structures are formed by themselves whereas man made structures are built to look like something ...
acid rain destroys man made structures
man made structures are something that a human builds, and a natural structure is something that comes into the world naturally.
They are man made structures