# How was the O-zone formed and why is it important for life on earth?

$3 {O}_{2} r i g h t \le f t h a r p \infty n s 2 {O}_{3}$
${O}_{2} \to 2 O$(1)due to the energy of $U V$rays
$2 {O}_{2} + 2 O r i g h t \le f t h a r p \infty n s 2 {O}_{3}$(2)
$3 {O}_{2} r i g h t \le f t h a r p \infty n s 2 {O}_{3}$