Answer-What is the name of the Earth's outermost solid layer?

Sol. The Earths outermost solid layer is called the lithosphere, which includes the crust and the upper mantle. This layer is about 60-200 km thick. Information Booster The lithosphere is the solid outer part of the Earth. It includes the crust and the upper mantle. Plate tectonics occur within the lithosphere. It is the foundation for geological phenomena. The lithosphere provides the necessary structure for life on Earth. --- Mantle The layer beneath the lithosphere. Core The Earths center, with a liquid outer core and a solid inner core. Biosphere The total area where life exists on Earth.