Even in calm weather, when the wind does not move the leaves, the aspen does not remain at rest. Her leaves tremble all the time. Why?

Even in the quietest weather, vertical air currents move above the ground. Warm streams rise upwards, cold streams descend. Aspen leaves, which have thin long petioles, are sensitive to the smallest air movements.

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.