Before life came into existence, carbon dioxide, nitrogen, and other heavy gases were left to stand by the Earth's mantle and earth's crust. These gases were captured by the gravitational force of the earth, and over time, an atmosphere grew. Gravity has caused the deposition of methane (CH4), carbon dioxide (CO2), ammonia (NH3), hydrogen (H2), nitrogen (N2), and water vapor (H2O) in the atmosphere in this way. Over time, the Earth was cool enough to allow the water vapor to condense and become liquid. This brought rain and strong hurricanes together. Constantly falling rain led to the formation of the sea. The electricity generated during the severe hurricanes affected the surface of the earth. At that time there was no oxygen in the free atmosphere because the oxygen merged with hydrogen and combined with other elements in the ground shell to form iron oxides, silicates, carbon dioxide and carbon monoxide. For over two billion years, all of the oxygen was bound to other elements. Ozone (O3) gas is formed as a result of the reaction of the oxygen gas with the oxygen atoms. This gas is about 15 km from the earth. is an important component of the stratosphere at high altitude The first creatures were anaerobic anaerobic respiration because there was no free oxygen in the atmosphere. In anaerobic respiration, photosynthesis evolution followed, that is, photosynthesis-capable creatures emerged. These creatures began to produce glucose and oxygen using water and carbon dioxide. Free oxygen then began to accumulate in the so-called stratosphere of the atmosphere. Ultraviolet rays were caused by the partition of these molecules into two oxygen atoms (O + O) by multiplying the oxygen molecules (O2) in this layer. These oxygen atoms combine with oxygen molecules to form ozone. (O + O2 & gt; O3). This is how the ozone layer formed. These reactions also occur in the same way today. The thickness of the layer is limited because there is not enough oxygen on the ozone layer. The lower layers do not reach the ultraviolet rays.
