You often observe how the leaves of trees move, the grass sways, etc.

You often observe how the leaves of trees move, the grass sways, etc. It is believed that this movement is due to the wind, air currents. Suggest experiences to support this explanation.

To solve the problem, you need to put a sheet of paper, turn on the fan and see in which direction your sheet of paper will fly.
For the purity of the experiment, make paper airplanes and lay them on top of each other. Thus, when you turn them on and place the plane between them, it will not fly away anywhere, but will remain hovering in one place.