We know, that Convection is the movement of groups of molecules within fluids such as liquids or gases, and within rheids
Examples of Global processes occurs by it:
1) Atmospheric Circulation. - It is the large-scale movement of air, and is a means by which thermal energy is distributed on the surface of the Earth, together with the much slower (lagged) ocean circulation system.
2) Oceanic Circulation . - Solar radiation affects the oceans: warm water from the Equator tends to circulate toward the poles, while cold polar water heads towards the Equator.
3) Weather. - Most important process if Weather including mineral cycle. Example in Hydrological cycle a foehn wind is a down-slope wind which occurs on the downwind side of a mountain range. It results from the adiabatic warming of air which has dropped most of its moisture on windward slopes.
Hope this helps!