The upper boundary of the biosphere extends from the Earth’s surface to the ozone screen. Above this border, organisms cannot live, since the ultraviolet rays of the Sun and low temperatures will be detrimental there. The lower boundary runs along the bottom of the hydrosphere and at a depth of 4-5 km in the earth’s crust of the continents (this depends on the depth at which the temperature of the rocks reaches + 100 ° C). The most abundant part of the biosphere is near the earth’s surface and up to a depth of 200 m in the hydrosphere.
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.