Wind is the flowe o gases on a lairge scale. On the surface o the Yird, wind consists o the bouk muivement o air. In ooter space, solar wind is the muivement o gases or chairged pairticles frae the sun throu space, while planetary wind is the ootgassin o licht chemical elements frae a planet's atmosphere intae space. Winds are commonly clessifee'd bi thair spatial scale, thair speed, the teeps o forces that cause them, the regions in that thay occur, an thair effect. The strangest observed winds on a planet in oor solar seestem occur on Neptune an Saturn.