Which scenario best exemplifies the impact of thermal currents on flight?

Soaring without flaps is a prime example of how thermal currents can positively influence flight. In this scenario, pilots utilize rising air currents, known as thermals, which are caused by uneven heating of the Earth's surface. When the sun heats the ground, warm air rises, creating lift that gliders or sailplanes can take advantage of.

By flying in these rising columns of air, pilots can sustain altitude or even gain height without the need for engine power or flaps. This technique allows them to make the most of natural atmospheric conditions, demonstrating the interplay between thermal currents and flight performance.

In contrast, the other scenarios do not directly illustrate the characteristics and benefits of thermal currents in the same way. Flying through a storm involves different factors, like turbulence and wind shear. Landing on a short runway focuses more on landing techniques and distance management, while flying in a steep descent relates more to descent rates rather than harnessing the benefits of thermals.