Question

Approximate height of ozone layer above the ground is
A. 30 to 40 km
B. 59 to 80 km
C. 70 to 100 km
D. 100 to 200 km

Answer 1

Hint: There are different layers of the earth’s atmosphere. Determine which one of the layers constitutes the infamous ozone layer. Define the purpose it solves and the height it is above the earth’s surface.

Complete step-by-step answer:
Earth's atmosphere consists of layers, each with its own specific importance. Moving upward from ground level, the layers are troposphere, stratosphere, mesosphere, thermosphere and exosphere. The exosphere gradually leads to outer space.
Stratosphere: The stratosphere extends from the top of the troposphere to about 50 km above the ground. Ozone layer is found within the stratosphere.
Ozone molecules in this layer absorb high-energy ultraviolet (UV) light from the Sun and convert the UV energy into heat. That is why the Ozone layer is so significant in our existence as UV rays are harmful to human beings. The Ozone layer lies roughly between roughly 15 and 35 km above Earth’s surface.

Additional information:
Depletion of the ozone layer is a major concern alarming the human life or life on earth in general. Ozone Depletion occurs when chlorine and bromine atoms come into contact with ozone in the stratosphere and destroy ozone molecules ($O_3$). One chlorine atom can destroy over 100,000 ozone molecules before it is removed from the stratosphere. Ozone is being destroyed more quickly than it is naturally being created.

Note: The stratosphere gets warmer the higher one goes. This means that air in the stratosphere lacks the turbulence as altitude increases. Commercial aeroplanes fly in the lower stratosphere, because of less turbulence.