Greenhouse
This is an old revision of this page, as edited by Ed Poor (talk | contribs) at 21:41, March 21, 2009. It may differ significantly from current revision.
A greenhouse is an plant nursery enclosed in glass to keep in warm air. The heat comes from sunlight's infrared spectrum, which is used in the heat lamps that keep McDonald's french fries warm. Instead of blowing away, the air remains inside.