Stratospheric ozone is formed naturally through the interaction of UV radiation with molecular oxygen.
not sure if this is what you want but hope it helps!!!
There are 3 significant figures. Significant numbers are the numbers that build up your total number. 1-9 always count, 0 only counts if it’s after another number. For example: 0,901 has 3 significant numbers as does 0,910. 9,10 also has 3. 0,09 has just 1.
Coronavirus??? I guessed sorry :/
