It's difficult to form a hypothesis on the exact appearance of Earth's interior as we can't directly observe it. However, scientists have been able to study seismic waves and make educated guesses about the composition and structure of Earth's interior. It is believed that the Earth is made up of three main layers: the crust, mantle, and core. The crust is the outermost layer and is made up of solid rock. The mantle is the thickest layer and is mostly made up of solid rock but with some areas of molten rock. The core is divided into two parts, the outer core which is liquid and the inner core which is solid. It is believed that the inner core is made up of solid iron and nickel, while the outer core is made up of liquid iron and nickel. These hypotheses are supported by various indirect evidence such as seismic data, magnetic fields, and the behavior of earthquakes.