How does the ozone layer make life on earth possible?

the ozone layer keeps the earth warm

the ozone protects us from the suns harmful rays

the ozone protects us from meteorites

the ozone provides us with oxygen to breathe

In what direction does the medium move relative to the direction of the wave? explain.

Imagine you had to physically add electrons, one at a time, to a previously neutral conductor. you add one electron very easily, but the second electron requires more work. in your initial post to the discussion, explain why this is. also, what happens to the work needed to add the third, fourth, fifth, and subsequent electrons

What are chlorofluorocarbons and what impact do they have on the atmosphere?