Stops heat escaping from a home
gravity
a pen
i think it is clot
Insulation, such as fiberglass.
Why, that would be Smog -- a worried derived from the two words, Smoke and Fog, first reportedly used in LA that has plenty of both.
LA, but there's a lot of smog there.
Carbon dioxide is a greenhouse gas, which captures heat rising from the surface of the earth and stops it escaping into space. In the same kind of way the glass in a greenhouse lets in the heat, but stops it escaping into the colder atmosphere outside.
LA sits in a valley surrounded by mountains, this makes the LA basin which, like a bowl holds smog and other atmospheric pollution
Clear days and little fog. Some smog
LA sits in a valley surrounded by mountains, this makes the LA basin which, like a bowl holds smog and other atmospheric pollution
They are massive enough to have a strong gravitional field which stops the gases escaping.