Inner Earth refers to the theoretical concept of a vast, unexplored region beneath the Earth's surface. This idea suggests that there may be significant geological formations, ecosystems, or even life forms existing deep within the planet. While mainstream science does not support the existence of a hollow Earth, some theories propose that the inner layers of the Earth, such as the mantle and core, could harbor unique conditions. The Earth's structure consists of several layers: the crust, mantle, outer core, and inner core. Each layer has distinct properties and compositions, with the inner core being solid and composed mainly of iron and nickel. Scientific exploration of the Earth's interior relies on methods like seismology, which studies how seismic waves travel through different materials, providing insights into the planet's composition and behavior.