11. In an ordinary thunderstorm, he said, warm air creates a convection cell that rises more or less vertically. 12. Accretion occurs over geoidal lows that can be caused by avalanche slabs or the downgoing limbs of convection cells . 13. Under experimental conditions, granular convection of variously sized particles has been observed forming convection cells similar to fluid motion. 14. "' B�nard cells "'are convection cells that appear spontaneously in a liquid layer when heat is applied from below. 15. These cells closely resembled the convection cells that form in a liquid heated from below and cooled at the top. 16. Such movement is called convection, and the moving body of liquid is referred to as a " convection cell ". 17. These density differences result in rising and / or falling currents, which are the key characteristics of a convection cell . 18. It asserts that super plumes rise from the deeper mantle and are the drivers or substitutes of the major convection cells . 19. Some tropical or subtropical regions such as the Philippines or south China are greatly affected by convection cells along a trough. 20. In nature, convection cells formed from air raising above sunlight-warmed land or water are a major feature of all weather systems.