Sisäkerrokset

Sisäkerrokset refers to the inner layers of the Earth's structure. Geologically, the Earth is commonly divided into three main layers: the crust, the mantle, and the core. The crust is the outermost solid shell, relatively thin and rocky. Beneath the crust lies the mantle, a much thicker layer composed of silicate rocks that are mostly solid but can deform and flow over geological timescales. The mantle is further subdivided into the upper mantle and the lower mantle. The uppermost part of the mantle, along with the crust, forms the rigid lithosphere. Below the lithosphere, the asthenosphere is a hotter, weaker, and partially molten zone of the upper mantle that allows the tectonic plates to move. The deepest layer is the Earth's core, which is divided into a solid inner core and a liquid outer core. The intense heat and pressure within the core are responsible for generating the Earth's magnetic field. Understanding these internal layers is crucial for comprehending phenomena such as plate tectonics, volcanism, and seismology.