Ozone in the atmosphere:?

Question

is produced by reactions between oxygen and the Sun’s energy.
is concentrated in the mesosphere.
comes from volcanic eruptions.
is produced by radioactive decay.

Answer 1

Ozone os produced by reactions between oxygen and the sun's energy.This happens in the stratosphere.But ground-level ozone is produced by the action of sunlight on primary emissions mainly from cars.
Ozone is more concentrated only in Stratosphere.
Volcanic eruptions, in fact,destroy ozone.
Ozone is not a product of radioactive decay.

Answer 2

Ultraviolet rays in sunshine have enough energy to break the bond between the two oxygen atoms (O) in normal oxygen molecules (O2), leaving them free to hook up with other oxygen molecules and form ozone (O3), so the first answer is looking good. This happens in the stratosphere, not the mesosphere, so two is out, and so on.