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322 - EASA Drone A2 License - What is the 'Wind Gradient' (or Wind Profile) near the surface?

Question 322 - Meteorology - EASA Drone License A2

The change in wind color during sunset
The phenomenon where wind speed is zero at the surface due to friction and gradually increases as altitude increases within the boundary layer
A sudden burst of wind from a storm
The temperature difference between two winds

Training tests and timed exam simulations EASA Drone License A2