Question

how does the atmosphere act as a blanket

Answer 1

1Atmosphere acts as a blanket by trapping terrestrial radiation and keeping warm
2 While the atmosphere permits incoming solar radiation to enter the biosphere it blows harmful rays including most ultraviolet radiation

Answer 2

The atmospheric is a mixture of variety of gases in different concentration and combination thus it acts as or like a blanket to our Earth and protects us from most of the harmful substance from outer space such as ultra violet radiation