Mantle structure refers to the internal composition and arrangement of the Earth's mantle, which is the layer of the Earth located between the crust and the core. It plays a crucial role in the dynamics and evolution of the Earth's geology, including plate tectonics, volcanism, and seismic activity. Research in mantle structure aims to understand the physical properties, temperature distribution, and composition of the mantle through various techniques such as seismology, mineralogy, and geochemistry. This knowledge helps scientists to better comprehend the underlying processes that drive Earth's geological phenomena and its impact on the planet's surface.