The solar cycle or solar magnetic activity cycle is the nearly periodic 11-year change in the Sun's activity (including changes in the levels of solar radiation and ejection of solar material) and appearance (changes in the number and size of sunspots, flares, and other manifestations).
Planet earth is generally thought of a composed of the atmosphere, the hydrosphere, the lithosphere and the biosphere. The geosphere is often used to mean the same thing as lithosphere - rocks and stones. If this is how you are using the word, then the geosphere consists of the crust, the mantle and the core. Comments.
geosphere, lithosphere-the solid part of the earth consisting of the crust and outer mantle. crustal plate, plate-a rigid layer of the Earth's crust that is believed to drift slowly. sial-the granitelike rocks that form the outermost layer of the earth's crust; rich in silicon and aluminum.