Venus has a structure similar to earth. It has an atmosphere, and a thin crust. Unlike earth, venus' crust is all in one piece. Below the crust is a mantle of melted rock, and a metallic core. Scientists aren't sure whether the core on venus is solid or not, but it is probably about the same size as earth's core, about 6000 km across. You might notice that, compared to mercury, venus has hardly any craters.