What is a gas in the upper part of Earth's atmosphere?

Answer 1

Ozone is a gas whose molecules are made up of three oxygen atoms* bonded together that occurs naturally in the upper atmosphere.

_____________________________________

*Not molecules, as in the question statement.

Answer 2

It's called ozone. it's a natural barrier to ultra violet light.

Answer 3

Ozone, but it consists of molecules each of which contains three oxygen atoms, not molecules.

Answer 4

There are several. One is carbon dioxide, one carbon atom and two oxygen atoms.

Others should feel free to add to this answer.

Answer 5

That is ozone.

Answer 6

ozone

Answer 7

water vapor