Final answer:
The concentration of ozone in the stratosphere is about 1015 ozone molecules per liter, forming a protective layer against the sun's ultraviolet radiation.
Step-by-step explanation:
The ozone layer has been recovering thanks to international efforts to phase out harmful CFCs. The naturally found concentration of ozone in the stratosphere is about 1015 ozone molecules per liter. This layer of ozone, often referred to as the ozone layer, is crucial for life on Earth since it absorbs most of the sun's harmful ultraviolet radiation. The presence of ozone in the stratosphere results from the interaction between oxygen molecules (O₂) and ultraviolet light from the sun, leading to the formation of ozone (O₃).
Despite historical reductions due to human-produced chemicals like chlorofluorocarbons (CFCs), international agreements have helped decrease this depletion, allowing the ozone layer to gradually recover and continue to protect the Earth.
Ozone naturally occurs in the stratosphere, which is a layer of the atmosphere located about 10 to 50 kilometers above the earth's surface. This layer contains the highest concentration of ozone, typically ranging from 1 to 10 parts per million (ppm). The ozone acts as a protective layer, absorbing harmful ultraviolet radiation from the sun, thus preventing it from reaching the earth's surface.