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.
Environmental and earth science study the interactions of four major systems or âspheresâ (figure 8.6). 1  The geosphere consists of the core, mantle and crust of the Earth.  The atmosphere contains all of the Earthâs air and is divided into troposphere, stratosphere, mesosphere, thermosphere and ionosphere.