Stops heat escaping from a home
gravity
a pen
Insulation, such as fiberglass.
The metal walls of the microwave oven reflect and contain the microwave radiation, preventing it from escaping.
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
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.
yes it stops moisture from the eyes escaping on cold days
It wasn't discovered and was created as a series of stops going north for the escaping slaves.