Two different types of this phenomenon co-occur between a Richardson number of 0.1 and 10. When the negative time derivative of temperature with respect to altitude is less than gravitational acceleration over heat capacity, per the Schwarzchild criterion a body is stable against this process. A coefficient governing this process symbolized h appears in the numerator of the Nusselt number. Bénard (“bay-NAR”) cells (10[1])form as a result of this process, which partly drives plate tectonics (10[1])when it occurs in the mantle. (10[1])Space heaters and high-end ovens use, for 10 points, what form of heat transfer due (10[1])to bulk motion of a fluid, contrasted with radiation and conduction? ■END■