The document describes the structure and composition of the Earth's layers from the surface down. It includes three main layers: 1. The lithosphere, which includes the crust and rigid outermost layer of the mantle. It can be continental or oceanic lithosphere. 2. The asthenosphere or upper mantle, which is soft and ductile. 3. The inner core and outer core, which make up the Earth's innermost layers. The crust varies in composition between continental crust of granite and sedimentary rock, and oceanic crust of basalt. Oceanic structures like mid-ocean ridges, seamounts, and trenches are also mentioned.