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 may be deemed by many to be the most important of the four spheres or subsections but it cannot be seen in isolation. The formation of the planetâs solid and molten structure is just as much significant as the formation of the other elements, from water to atmosphere because they coexist.