While explaining the recent developing ozone hole on Antarctica, teacher makes a remark that 'without ozone layer, organisms cannot survive on Earth'. Kalpana gets curious about the various aspects of ozone layer and asks some questions to her teacher.
How is ozone layer formed?
When UV radiations from the sun reaches earth’s atmosphere which is heavily rich in oxygen. Then these UV rays split molecular oxygen (O2) into free oxygen (O). Afterwards, this free oxygen reacts with molecular oxygen; it forms ozone (O3).
This ozone now protects the earth from harmful UV radiations of sun, by allowing only some percent of rays to fall on the earth’s surface. Ozone acts as a filter of sun rays. These rays can cause skin cancer in human and can also affect other living organisms.