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Question 44 (1 point) Thermals are a common source of lift for sailplanes. Many cross-country glider flights longer than 1,000 km (540 n.m.) have been made by using the thermal updrafts associated with dry convection. (_) True (_) False Question 45 (1 point) What would be the first sign that you have encountered a classic microburst while on approach to an airport? (_) Severe Turbulence () Encountering precipation C) Airspeed increases and descent rate decreases ( ) Airspeed decreases and descent rate increases. Question 46 (1 point) Dust devil formation is favored under light wind conditions over very hot surfaces, such as over barren desert areas in summer and in the early afternoon. Once formed, they have a preferred direction of rotation. (_) True (_) False Question 47 (1 point) Hail is most likely to be associated with cumulonimbus clouds. (_) True () False