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.
Earth is one large planet, but it can be divided into four main spheres, which get their names from Greek words. The geosphere is all of the rock, land and minerals on Earth, and you can remember this because 'geo' means 'ground.' The hydrosphere is all of the water on Earth, which makes sense since 'hydro' means 'water.'